In watercolour painting, unlike other media, the whites are not added as paint but are reserved areas of the paper that are not painted on, so the white is the colour of the paper. Masking fluid is a liquid latex-based product that is very effective at keeping small areas and thin lines white when painting on watercolour paper. The rubber prevents the paint from reaching the paper and is peeled off to expose the white paper left untouched. The masking fluid can be applied in many ways, almost any tool will work. You may use a brush, a ruling pen, a dental pick, a Colourshaper applicator or a special Masquepen or Super Nib which is a needle that gives extremely fine lines. (The Super Nib comes with an empty bottle that is for filling with water, attaching the needle to the end and squirting the water through the needle tip to clean it when finished. Do this straight away or the needle will be very difficult to clean.) If you need splattered white dots you can flick the masking fluid from an old toothbrush. If using a brush you might want to keep one inexpensive brush to use exclusively for
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