A low- viscosity formula, that increases the granulation of colour, giving a natural mottled appearance to colours which usually give a smooth wash (e.g. Winsor Blue), or enhancing the effect of granulating colours (e.g. French Ultramarine)...
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Love the idea of the use for the free watercolor postcards and they are quality. The granulation medium is new to me so I'm trying it out, but so far I like it.