In watercolour painting the whites are not generally added as paint but are reserved areas of the paper that are not painted on.
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How to Use Masking Fluid
Masking Fluid: Your Watercolor Secret Weapon!
3M Overspray Masking Liquid Dry, 06847, 1 Gallon, Factory : Automotive
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DANIEL SMITH Masking Fluid - DANIEL SMITH Artists' Materials
Pour Painting Supplies Guide by Olga Soby I Fluid Art Supplies – Olga Soby Shop
Pour Painting Supplies Guide by Olga Soby I Fluid Art Supplies – Olga Soby Shop