How to Use a Watercolour Dot Card to Test Colours Before You Buy

What Is a Watercolour Dot Card?

A watercolour dot card is a sheet of watercolour paper pre-loaded with small dried dots of real watercolour paint — one dot per colour. Each dot contains actual pigment from the manufacturer, so you can activate it with a wet brush and see exactly how the colour behaves on paper before investing in a full pan or tube.

Think of it as a try-before-you-buy experience for serious artists.

Why Use a Dot Card?

Choosing watercolours from a screen or a colour chart is unreliable. Monitor calibration, printing variation, and the difference between wet and dry colour all mean that what you see online rarely matches what ends up on your paper. A dot card solves this problem by giving you the real pigment to test yourself.

Dot cards are especially useful when:

• You're considering a new brand and want to compare it to your current paints
• You want to identify which specific colours to buy individually rather than committing to a full set
• You're building a custom palette and need to check granulation, transparency, and lightfastness behaviour
• You're a colour-sensitive artist (illustrators, botanical painters) who needs precise pigment knowledge

How to Use a Watercolour Dot Card

Using a dot card is simple:

1. Wet your brush with clean water and touch it gently to a dot of colour.
2. Paint a swatch on a spare piece of watercolour paper — try a flat wash, a gradient, and a wet-on-wet blend.
3. Let it dry and observe the colour shift, granulation, and transparency.
4. Make notes directly on the dot card or in a sketchbook so you remember your findings.

You can test each dot multiple times — there's enough pigment for several swatches per dot.

What to Look For When Testing

Transparency: Hold the swatch up to light. Transparent colours glow; opaque colours block light. Both have their uses, but knowing which is which helps you layer effectively.

Granulation: Some pigments separate and settle into the texture of the paper, creating a beautiful grainy effect. Others stay smooth. Neither is better — it depends on your style.

Colour shift: Watercolours dry lighter than they appear when wet. A dot card test lets you see the true dry colour before you commit.

Try the ROSA Gallery Watercolour Dot Card

The ROSA Gallery Watercolour Dot Card gives you access to all 100 colours in the ROSA Gallery professional range on a single sheet of quality watercolour paper. It's the most efficient way to explore the full ROSA Gallery palette and identify your must-have colours before building your collection.

Build Your Palette with Confidence

Once you've tested your colours, shop the full watercolour paints collection or explore our watercolour sets and kits to put your perfect palette together.