Watercolour mistakes can easily be removed using this magic watercolour eraser sponge!To use dampen the sponge with clean water (squeeze out so only damp to touch, not soaking wet) and gently pat out the watercolour area you wish to remove. It will gradually lift away the mistakes!  Do not rub vigorously as you can damage the surface of the watercolour paper -a gentle rub or dabbing will take most marks out.Sponge is approximately 10.4cm x 6.2cm x 1.5cm and can be cut into smaller pieces for ease of use.