The Complete Guide to Watercolour Paints and Supplies — Pans, Tubes, Brushes, and Paper

Why Watercolour Endures

Watercolour has been used in one form or another for thousands of years, from ancient Egyptian manuscripts to the luminous English landscape tradition and the bold experimentation of modern artists. Despite the arrival of acrylics, oils, and digital media, watercolour painting has not only survived but flourished — taken up by more people today than at any point in its history.

The appeal is both practical and emotional. The materials are portable, the setup is minimal, and the cleanup requires nothing more than water. You can paint at a kitchen table, in a park, on a train, or in a dedicated studio. A small tin of paints, a brush, a bottle of water, and a pad of paper fit into a bag, making watercolour the most portable of all serious painting mediums.

But it is the character of watercolour that keeps painters coming back. No other medium captures light in the same way. Because the pigment sits in transparent layers on white paper, light passes through the paint, reflects off the paper surface, and returns through the colour — creating a luminosity that opaque paints cannot replicate. Watercolour has a mind of its own: it flows, blooms, blends, and occasionally does things you did not intend. Learning to work with that unpredictability rather than against it is part of the joy.

It is also honest. Watercolour does not hide mistakes easily. There is no thick layer of paint to cover errors, no sanding back and starting over. This can be intimidating for beginners, but it is also what makes the medium so satisfying to master. Every watercolour painting is, in some sense, a collaboration between the painter and the paint.

How Watercolour Paint Works — The Science of Transparency

Understanding what is happening when you apply watercolour helps you make better choices about materials and technique.

Watercolour paint consists of pigment (the colour) suspended in a binder of gum arabic — a natural substance harvested from acacia trees. Additional ingredients may include glycerine (to keep the paint moist and reworkable), honey (used by some manufacturers to improve flow and rewetting), ox gall or synthetic wetting agents (to help the paint spread evenly), and a preservative.

When you wet the paint and apply it to paper, the water carries the pigment particles into the fibres and surface texture of the paper. As the water evaporates, the pigment remains held in place by the gum arabic binder, which dries to a thin, largely transparent film. Because the paint layer is so thin and transparent, the white paper beneath acts as the light source — reflecting light back through the pigment and giving watercolour its characteristic glow.

This is fundamentally different from opaque paints like acrylics or oils, where the colour sits on top of the surface and reflects light from the paint layer itself. In watercolour, the paper is not just a surface — it is an active part of the painting. White areas in a watercolour painting are simply unpainted paper. Light tones are achieved by diluting the paint with more water, allowing more of the paper to show through. This is why paper quality matters enormously in watercolour — more so than in any other painting medium.

Pans vs Tubes — Two Formats, Different Strengths

Watercolour paint is sold in two main formats: dried cakes called pans, and moist paste in tubes. Both contain the same pigments and binder — the difference is in how they are manufactured, stored, and used.

Pans

Pans are small rectangular cakes of dried watercolour, typically available in half pan and full pan sizes. Half pans hold approximately 2.5ml of compressed paint; full pans hold roughly 5ml. Pans are stored in metal or plastic tins — often with a built-in mixing area in the lid — and are activated by wetting the surface with a loaded brush.

Strengths of pans: Pans excel at portability. A compact tin of twelve or twenty-four half pans, with a mixing lid and a water brush, is a complete painting kit that fits in a coat pocket. For outdoor painting (often called plein air), travel sketching, and painting on the move, pans are hard to beat. They are also economical with paint — you naturally use small amounts because you are working the brush across the surface of the cake rather than squeezing from a tube. Pans last a remarkably long time; a well-made set can remain usable for decades with proper care.

Limitations of pans: Working up a large, saturated wash from a pan takes time and effort — you must repeatedly wet and load the brush from the small cake surface. For large-scale work or techniques that require big pools of rich, concentrated colour, pans are less practical. The dry surface also means some very hard or very soft pigments behave differently in pan form compared to tubes.

Tubes

Tubes contain watercolour paint in a moist, paste-like form — ready to squeeze directly onto a palette and mix with water. Tube sizes vary from small 5ml tubes to large 37ml tubes, depending on the manufacturer.

Strengths of tubes: Tubes deliver concentrated colour quickly. You can squeeze out as much as you need and mix large pools of rich, vibrant wash immediately — essential for working on larger paper or covering broad areas. Many painters find tube colours feel more vibrant straight from the tube because the pigment is already in a moist, readily dispersible form. Tubes also offer a wider colour range from most manufacturers, including specialty pigments that may not be available in pans.

Limitations of tubes: Tubes are less portable than a pan set — they require a separate palette, and there is always the risk of caps sticking or tubes bursting in luggage. Paint left on a palette will dry, though it can be rewetted (many painters deliberately squeeze tube paint onto a palette and allow it to dry, effectively creating their own custom pans). Tubes also make it easier to waste paint by squeezing out more than you need.

Which Should You Choose?

Many watercolourists eventually use both — a portable pan set for sketching and travel, and tubes in the studio where colour intensity and volume matter more. If choosing one format to start with, a pan set is often the most accessible: it comes with a mixing surface, a curated range of colours, and everything you need to begin painting immediately.

Quality Grades — Student vs Artist

Like other painting mediums, watercolour is manufactured at different quality levels.

Student grade watercolours use lower concentrations of pigment, more filler, and simpler formulations. They are perfectly adequate for learning, practicing techniques, and casual painting. The colours are less intense, particularly when diluted to pale washes, and mixing can produce muddier results because of the higher filler content. Student-grade paints are often available in larger sets at lower prices, making them an accessible starting point.

Artist grade (also called professional grade) watercolours contain high concentrations of carefully selected, finely ground pigments in a quality binder. The colours are more intense, washes are cleaner and more luminous, mixing produces clearer results, and the pigments are selected for permanence. Like artist-grade acrylics, colours are priced in series based on pigment cost — earth colours are less expensive than cadmiums or cobalts.

The difference between student and artist grade is genuinely noticeable in watercolour — perhaps more so than in any other medium. Because watercolour relies on transparency and the quality of the pigment is so directly visible (there is nothing to hide behind), the step up from student to artist grade is often described by painters as transformative. If your budget allows, starting with a small set of artist-grade colours — even just six or eight — will give you a truer experience of what watercolour can do.

Understanding Pigment, Transparency, and Granulation

Watercolour has some unique properties worth understanding when choosing colours.

Transparency and Opacity

Every watercolour pigment falls somewhere on a spectrum from fully transparent to semi-opaque. Transparent colours allow paper and previous layers to show through completely, creating luminous glazes and clean layered effects. Semi-opaque colours (sometimes called "sedimentary" depending on their behaviour) have more covering power and can appear slightly milky when diluted heavily.

Manufacturers indicate transparency on the tube or pan label, usually with a small square symbol — empty for transparent, half-filled for semi-transparent, filled for opaque. For classic watercolour effects — glowing washes, luminous skin tones, layered skies — prioritise transparent colours.

Granulation

Some pigments, when diluted and applied to textured paper, separate into visible particles that settle into the paper's valleys, creating a beautiful, speckled, grainy effect. This is called granulation and it is a characteristic that many watercolourists actively seek out. Earth colours (burnt sienna, raw umber), some blues (ultramarine, cerulean), and cobalt-based pigments are naturally granulating. The effect is more pronounced on cold press and rough paper.

Granulation is not a flaw — it adds texture, atmosphere, and visual interest that is unique to watercolour. Some manufacturers specifically label colours that granulate strongly, and some produce "super-granulating" formulations designed to maximise this effect.

Staining vs Lifting

Some pigments stain the paper fibres permanently when applied, making them difficult or impossible to lift (remove) once dry. Others sit more lightly on the surface and can be lifted with a damp brush or sponge even after drying, allowing corrections and deliberate lightening effects.

Staining colours include phthalo blue, phthalo green, alizarin crimson, and many modern organic pigments. Liftable colours include cobalt blue, cerulean blue, and most earth colours. Knowing which colours in your palette stain and which lift gives you more control over corrections and techniques.

Building a Starter Palette

A well-chosen starter palette for watercolour needs fewer colours than you might expect. Because the medium is transparent and relies on mixing and layering, a limited palette teaches you more and produces more harmonious paintings than a large set of pre-mixed colours.

A versatile starter palette (eight to ten colours):

• Warm yellow — Raw sienna, yellow ochre, or new gamboge
• Cool yellow — Lemon yellow or aureolin
• Warm red — Cadmium red, pyrrole red, or vermilion hue
• Cool red — Quinacridone rose, permanent rose, or alizarin crimson permanent
• Warm blue — Ultramarine blue (naturally granulating — beautiful in skies and shadows)
• Cool blue — Phthalo blue or Winsor blue (intensely powerful — use sparingly)
• Burnt sienna — A warm, rich brown essential for landscapes, skin tones, and mixing natural darks
• Burnt umber — A cooler, deeper brown that mixes with ultramarine to produce beautiful neutral darks

Optional additions:

• Cerulean blue — A soft, semi-opaque sky blue with lovely granulation
• Viridian or phthalo green — A useful green base, though many painters prefer mixing greens from blue and yellow

Colours you do not need to start: In watercolour, white paint is rarely used — white comes from the paper. Black is also typically mixed from complementary colours (burnt umber + ultramarine blue makes a rich, versatile dark) rather than used from a tube. Pre-mixed greens, oranges, and purples are convenient but not essential when you are learning to mix.

Watercolour Paper — The Supply That Matters Most

If there is one piece of advice that experienced watercolourists consistently offer beginners, it is this: invest in good paper. More than brushes, more than paints, the paper you use determines how your watercolour behaves, how your colours look, and how much you enjoy the process.

Poor paper — thin, poorly sized, made from wood pulp — buckles when wet, absorbs paint unevenly, resists blending, and makes colours look dull. Good paper — heavy, well-sized, made from cotton — stays flat, accepts paint beautifully, allows blending and lifting, and makes colours glow. The difference is dramatic and immediate. Many beginners who struggle with watercolour and assume they lack skill are actually fighting against inadequate paper.

Paper Textures Explained — Hot Press, Cold Press, and Rough

Watercolour paper is manufactured with three surface textures, determined by how the paper pulp is pressed during production.

Hot Press (Smooth)

Hot press paper is passed through heated rollers under high pressure, producing a smooth, dense surface with very little texture. Paint sits on the surface rather than sinking into valleys, creating crisp, vivid colours. Hot press is the choice for detailed botanical illustration, pen and wash work, and any technique requiring fine lines and precision. It is also unforgiving — mistakes are more visible, washes can dry unevenly, and blending requires more skill.

Cold Press (Medium Texture)

Cold press paper (called "NOT" in British terminology — meaning "not hot pressed") has a gentle, irregular texture created by pressing the pulp through cold rollers covered in textured felt. This slight roughness holds water and pigment in its surface valleys, making washes more even and forgiving. Cold press is the most popular and versatile watercolour paper, suitable for everything from landscapes to portraits, and the standard recommendation for beginners.

Rough

Rough paper has a pronounced, deeply textured surface with significant peaks and valleys. Washes applied over rough paper show strong textural effects as pigment settles into the valleys and skips across the peaks. This creates character and atmosphere, particularly suited to expressive landscapes and loose, impressionistic work. Rough paper is less suited to fine detail. Dry brush techniques — where a lightly loaded brush is dragged across the surface — produce dramatic effects on rough paper.

Paper Weight, Cotton vs Cellulose, and Why It All Matters

Weight

Paper weight is measured in grams per square metre (gsm) or pounds (lb). The higher the number, the thicker and more robust the paper.

190 gsm (90 lb) — Lightweight. Buckles significantly when wet unless stretched beforehand. Suitable for dry techniques and light washes but frustrating for wet-on-wet work. Best treated as practice paper.

300 gsm (140 lb) — The standard weight for watercolour painting. Heavy enough to resist most buckling, sturdy enough for multiple layers and generous washes. This is what most watercolourists use for finished work, and the weight to aim for when buying paper.

425–640 gsm (200–300 lb) — Heavyweight to very heavy. These papers handle even the most aggressive wet techniques without buckling and feel luxuriously sturdy. They are more expensive but eliminate the need for stretching entirely.

Cotton vs Cellulose

Cotton paper (sometimes called "rag paper") is made from cotton fibres. It is strong, naturally white, acid-free, and absorbs water in a controlled, even way that gives watercolour its best behaviour. Cotton paper allows paint to flow smoothly, accepts multiple layers without breaking down, and enables lifting and blending techniques that are difficult or impossible on cheaper paper. Most professional watercolour paper is 100% cotton.

Cellulose paper (wood pulp based) is made from processed wood fibres. It is significantly less expensive and perfectly usable for practice, studies, and learning. However, cellulose paper absorbs water less evenly, can buckle more, may yellow over time, and does not support advanced techniques as well as cotton. Some papers use a cotton-cellulose blend, offering a middle ground in both quality and price.

Paper Formats — Pads, Blocks, Sheets, and Rolls

Pads — Sheets bound along one edge (glued or spiral-bound) that can be torn off individually. Convenient and affordable, particularly in student-grade ranges. Individual sheets may buckle when wet unless taped down.

Blocks — Sheets glued along all four edges to a backing board. The glue holds the paper taut while you paint, preventing buckling without the need for stretching. You remove the finished painting by sliding a palette knife under the top sheet at the small unglued gap. Blocks are popular, practical, and especially convenient for outdoor work.

Loose sheets — Individual full-sized sheets (typically around 56 × 76 cm / 22 × 30 inches) that can be cut to any size. This is the most economical way to buy quality paper and the preferred format for experienced painters. Sheets need to be taped or stretched before use to prevent buckling.

Rolls — Large rolls of paper for very big work or for cutting many custom-sized sheets economically.

Watercolour Brushes — Shapes, Sizes, and Materials

A good watercolour brush holds water well, comes to a fine point (for round brushes), springs back to its shape after each stroke, and releases paint in a controlled, even flow. The brush is arguably the most personal of all painting tools — every watercolourist develops preferences over time.

Brush Materials

Kolinsky sable — Considered the finest natural brush hair for watercolour. Kolinsky sable brushes hold an exceptional amount of water, maintain a perfect point, and have a spring and responsiveness that many painters consider unmatched. They are also expensive — a single large Kolinsky sable brush can cost as much as a full set of student-grade paints.

Other natural hair — Squirrel hair (very soft, excellent water capacity, less spring — popular for mop brushes and large washes), goat hair, and ox hair are all used in watercolour brushes at various price points.

Synthetic — Modern synthetic brushes have improved enormously and now offer excellent performance at a fraction of the cost of natural hair. Quality synthetics hold water well, maintain a good point, and are more durable than natural hair. They are also the ethical choice for painters who prefer not to use animal-derived products. For beginners, a quality synthetic set is the most practical and cost-effective starting point.

Synthetic-natural blends — These combine natural hair (often sable) with synthetic fibres to achieve a balance of performance and affordability.

Brush Shapes

Round — The most important and versatile watercolour brush shape. A good round brush with a fine point can produce both broad washes (using the belly of the brush) and fine detail (using the tip). Rounds in sizes 6, 8, and 12 cover most needs.

Flat (or one-stroke) — A flat, square-edged brush useful for broad washes, sharp edges, and geometric shapes. A 12mm or 25mm flat brush is useful for wetting paper and applying large washes.

Mop — A large, soft, round brush that holds an enormous amount of water. Used for wetting paper, applying background washes, and softening edges. Often made from squirrel hair or a soft synthetic.

Rigger (or liner) — A very thin, long-haired round brush designed for fine lines — branches, grasses, rigging on boats (hence the name). A single rigger can be one of the most useful brushes in a watercolourist's kit.

Water brush — A brush with a built-in water reservoir in the handle. You squeeze the barrel to feed water to the bristles. Water brushes are designed for portability and pair well with pan paints for sketching and travel. They do not offer the same control or capacity as a traditional brush, but their convenience is hard to beat.

How Many Brushes Do You Need?

To start: a medium round (size 8 or 10), a large round or mop (size 14 or a mop brush), and a small round (size 4) will cover most techniques. A flat brush for washes is a useful fourth brush. Add a rigger when you want to paint fine lines. Resist the urge to buy a large set of brushes before you know what shapes and sizes suit your style.

Essential Accessories — Palettes, Water Containers, and Masking Fluid

Palette — A white surface for mixing paint. Ceramic palettes and porcelain plates are traditional favourites because paint does not bead up on the surface. Plastic palettes with wells and mixing areas are lighter and more portable. The lid of a pan set doubles as a palette in the field.

Water containers — Two jars of clean water are better than one: use one for rinsing dirty brushes and one for clean mixing water. Outdoors, collapsible water containers or clip-on water cups work well.

Masking fluid — A liquid latex applied to paper before painting to preserve white areas. Once your paint is dry, the masking fluid peels or rubs away to reveal the untouched paper beneath. Useful for preserving highlights, white shapes, and fine details in complex paintings. Apply with an old brush or a silicone-tip applicator — masking fluid ruins good brushes.

Spray bottle — A fine mist sprayer for wetting paper, keeping paints moist on the palette, and creating textural effects.

Natural sponge — Useful for wetting paper, creating textured effects, and lifting paint.

Paper towel or cotton rag — For blotting excess water from the brush, lifting paint, and controlling moisture. You will use more paper towel than you expect.

Techniques That Shape Your Supply Choices

Different watercolour techniques call for different supplies, and knowing what you want to try helps you buy wisely.

Wet on dry — Applying paint to dry paper. Produces crisp, controlled edges. Works well on any paper texture and requires less heavy-weight paper.

Wet on wet — Applying paint to pre-wetted paper. Colours blend and bloom softly, creating atmospheric, diffused effects. Requires heavier paper (300 gsm minimum) and benefits from cotton paper, which holds moisture more evenly.

Glazing — Building up transparent layers of dry paint over previously dried layers. Each layer modifies the colour beneath, creating complex, luminous results. Requires patient drying between layers and works best with transparent, non-staining colours.

Dry brush — Using a brush with very little water to drag colour across the texture of the paper. Creates rough, textured marks. Most effective on cold press or rough paper.

Lifting — Removing paint from the paper with a damp brush, sponge, or tissue. Useful for correcting mistakes, creating highlights, and softening edges. Works best with non-staining colours on cotton paper.

Choosing the Right Supplies — A Comparison

Common Mistakes and How to Avoid Them

Using thin, cheap paper. This is the single most common source of frustration for watercolour beginners. Paper that buckles, pills, or refuses to hold a wash makes the medium feel impossible. Upgrade to 300 gsm cold press paper and the experience changes immediately.

Using too little water. Watercolour is called watercolour for a reason — it needs water to work. Beginners often use too little, producing dry, scratchy results. Load the brush generously and let the paint flow. You can always blot excess, but you cannot add fluidity after the fact.

Using too many colours at once. Mixing more than three colours together almost always produces mud. Work with limited mixes — two colours plus water is usually enough for any passage. If your colours are getting dull and grey, simplify your mixing.

Overworking wet paint. Once a wash has started to lose its sheen (indicating it is beginning to dry), stop touching it. Working into a drying wash produces hard edges, back-runs, and a tired, overworked appearance. Either work quickly while the paper is fully wet, or let it dry completely and apply a fresh layer.

Forgetting to preserve white areas. In watercolour, there is no white paint to go back with (Chinese white and gouache exist but change the character of the medium). Plan your whites — unpainted paper is your lightest value. Masking fluid helps preserve small, complex white shapes.

Ignoring the palette. Mixing on the paper is a valid technique, but you also need to mix on a palette to control colour and value before committing. A generous palette with plenty of mixing space makes a real difference.

Neglecting brush care. Watercolour brushes, especially natural hair, require gentle treatment. Rinse thoroughly after each session, reshape the bristles, and store upright or flat — never with the bristles pointing down in a jar.

What Watercolour Cannot Do — Honest Limitations

It does not cover mistakes easily. Unlike acrylics or oils, you cannot simply paint over an error with an opaque layer. Some lifting and correction is possible, but watercolour fundamentally rewards planning and confidence. This is part of its character, not a flaw, but it is a reality worth accepting before you begin.

Large, even areas of flat colour are difficult. Achieving a perfectly even wash of a single colour across a large area is one of the hardest basic techniques in watercolour. It requires practice, the right paper, and good technique. Other mediums handle flat colour more easily.

Dark values require patience. Building up to truly dark passages in watercolour means applying multiple transparent layers, drying between each one. Patience and planning are required. The temptation to use too-dark a wash in a single layer often results in a flat, dead-looking passage.

Colours lighten as they dry. Watercolour dries lighter than it appears when wet — the opposite of acrylic paint. This means you need to apply paint slightly stronger than your target value, which takes experience to judge.

It is not as archival as some believe. Watercolour paintings are sensitive to light, moisture, and humidity. Professional framing with UV-protective glass and acid-free mounting is important for any watercolour you want to preserve long-term. Without protection, colours can fade and paper can yellow over decades.

Portability has limits. While the paints are wonderfully portable, painting outdoors means dealing with wind, sun drying your washes too fast, and inconsistent water supply. Outdoor watercolour painting is delightful but requires some practical adaptation.

Caring for Your Supplies

Paints: Pan sets should be closed after each session to keep dust out. Allow pans to air-dry before closing if they are still wet from painting. Tubes should be stored with caps firmly closed — if a cap sticks, warm water usually frees it. Stored properly, both pans and tubes have a very long shelf life — decades in many cases.

Brushes: Rinse thoroughly with clean water after every session. Never leave brushes standing in water — this bends the bristles permanently and can loosen the ferrule. Reshape the bristles gently with your fingers and lay flat or stand upright to dry. Avoid hot water, which can damage natural hair and loosen glue.

Paper: Store in a cool, dry place away from direct sunlight. Keep flat to prevent curling. Once opened, pads and blocks should be kept in a clean, dry environment. Cotton paper stored correctly will last indefinitely without degrading.

Your Pre-Purchase Checklist

What subjects and style interest you?

Loose, atmospheric landscapes suit cold press or rough paper and benefit from granulating colours. Detailed botanical work suits hot press paper and precise, non-granulating colours. Urban sketching suits a portable pan set and a compact sketchbook.

What paper weight and type will you use?

Aim for 300 gsm (140 lb) cold press as your starting point. Cotton paper if your budget allows; cellulose for practice work. Buy the best paper you can afford — it makes more difference than upgrading your paints.

Pans or tubes?

Pans for portability and convenience. Tubes for studio work and large-scale painting. Both are valid — a pan set is the simplest way to begin.

How many colours do you need to start?

Eight to twelve is plenty. A smaller, well-chosen palette teaches more than a large set of pre-mixed colours. Prioritise a warm and cool version of each primary, plus earth colours.

Do you have at least two or three brushes in different sizes?

A medium round, a large round or mop, and a small round will cover most needs. Quality matters more than quantity.

Have you allowed for accessories?

A palette (or pan set with mixing lid), two water containers, paper towel, and optionally masking fluid. These small items make a meaningful difference to your painting experience.

Why Buying Through Amazon Is a Smart Option

Amazon stocks watercolour supplies from student-grade sets through to professional artist materials, with extensive customer reviews from painters who have used the products in practice. The ability to compare brands, formats, and price points in one place is especially useful when building a watercolour setup, where every component — paint, paper, and brushes — interacts with the others. Convenient delivery is a particular benefit when ordering paper, which is heavy and awkward to carry.