Watercolor Salt Technique: Textures by Chance, Step by Step

The watercolor salt technique is a simple trick that turns a flat wash into a sky full of stars, a frosty window or a coral reef. You paint a wet wash, sprinkle salt into it, and wait. As the paint dries, each grain draws water and pigment towards itself and leaves a pale, star-shaped mark. You decide where the salt falls, but not the exact pattern it makes, which is why it belongs on a site about froissage and other chance techniques.

What happens on the paper

Watercolour is pigment carried in water, held to the paper by a small amount of binder. While the wash is wet, pigment particles float and move with the water. A grain of salt absorbs water from its surroundings. Water flows towards it from all sides and carries pigment with it, and as the paint dries, a pale spot with a feathery edge remains where the grain sat. Around it, pigment is often a little darker where the flow stopped.

Tate’s glossary describes watercolour as paint whose transparency lets the white of the paper show through. That is what makes the salt marks glow: where pigment has been pulled away, the paper itself shines through.

Materials

• Watercolour paper. Heavier paper (around 300 gsm) stays wet longer and does not buckle much.
• Watercolour paints or liquid watercolour. Deep blues, purples, greens and reds show the effect best.
• Salt. Coarse sea salt or rock salt for large stars; fine table salt for small speckles. Try both.
• A large soft brush and clean water.
• A soft dry brush or cloth to remove the salt afterwards.

Timing: the key to the effect

Most failed salt paintings are a timing problem.

• Too wet. If the paint is still in pools, the salt dissolves and the effect spreads into blurry halos.
• Just right. When the pools have soaked in and the surface shine is starting to dull, the salt makes crisp stars.
• Too dry. If the paint has lost all its shine, the salt sits on top and does nothing.

Because a wash dries unevenly, one painting often shows all three stages at once. That variety is part of the charm. For more control, work in small sections and salt each one as it reaches the right stage.

Step by step

1. Tape your paper to a board so it stays flat.
2. Brush a generous wash of colour, or several colours blending into each other.
3. Watch the surface. When it loses its glassy look, sprinkle salt from about 20 cm above.
4. Do not move the board or touch the paint. Leave it to dry flat.
5. When it is completely dry, brush all the salt away over a bin.
6. Look at the texture from all sides before deciding whether to add anything.

Project ideas

• Night sky. A deep blue and purple wash with fine salt makes a starry sky. Add a black silhouette of trees or rooftops once dry.
• Snow and frost. Pale blue and grey with coarse salt gives snowflakes; the effect also suits a frozen window.
• Under the sea. Greens and blues with coarse salt look like bubbles and coral; add fish with a pen.
• Autumn leaves. Paint leaf shapes in reds and oranges, salt them, and cut them out to combine with autumn leaves crumpled paper art.
• Abstract textures. Fill a page with colour and salt, then cut it up for froissage collage.

Combining salt with crumpled paper

Salt and froissage work well together because both make texture without a brush. Try this: crumple a sheet of watercolour paper, open it and flatten it lightly, then paint a wet wash over it. The colour gathers in the creases. While it is still damp, sprinkle fine salt over part of the sheet. When dry, you have two kinds of chance texture: angular crease lines and soft starbursts. Our guide to froissage with watercolour and ink explains the crumpling stage in detail.

As with any froissage sheet, the next step is to look. Turn the paper around and see whether the combination suggests a landscape, a night scene or a creature. Our page on pareidolia in art explains why the eye finds figures in such patterns.

Salt among other chance textures

Salt is one of several household materials that painters drop into wet watercolour to see what happens. Others include drops of clean water (which push pigment outwards into soft blooms), a few drops of rubbing alcohol (which repel paint into crisp circles), and cling film pressed onto a wet wash and left to dry (which leaves angular, crystalline lines not unlike froissage creases). Try them side by side on one test sheet and label each one; a reference sheet like this is useful for planning later work.

Troubleshooting

• No effect. The paint was too dry or the paper too absorbent. Work faster after laying the wash.
• Huge pale blotches. The paint was too wet, or too much salt was used. Use less and wait a little longer.
• Salt will not come off. The painting is not fully dry. Wait, then brush gently.
• Colour looks weak. Use more pigment; salt effects show best on strong colour.

In the classroom

Salt painting is reliable with groups from about five years old. Put salt in small pots with spoons rather than shakers, so children can drop pinches where they choose. Work on trays so the salt does not spread across the room. Ask pupils to predict where the stars will appear before the painting dries, then compare. It is a good introduction to the idea of chance in art, and it pairs well with blow painting with straws in the same session.