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Watercolour vs Designers Gouache

Watercolour versus gouache, what are the differences? Both are water-based pigments with Gum Arabic, but they are quite different. Watercolours are transparent and offer a broad tonal range, from the colour straight out of the tube to a diluted undertone. Conversely, gouache is opaque with a perfectly matt finish, making it perfect for solid blocks of colour. Although you can achieve a near solid colour with layers of watercolour and gain some transparency by diluting gouache, it is best to reach for watercolour when you want transparency and a range of tonal value, and choose gouache for opaque strong colours.