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Handprint: Watercolors (Paints, Techniques, and More)
A comprehensive resource for watercolorists that includes a clickable index of topics ranging from biographies and critiques of recognized masters of the art of watercolor to information on how the eye perceives light, on paper choices,...
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Watercolor painting.com: Pigments and Paint
This resource provides an extremely detailed account of watercolor pigments and paints. It includes a long list of colors and how they are made.