Pebeo Studio Gouache 220-Milliliter, Trichromatic Black The range includes 24 colors of which 2 metallic colors that are available in 20ml, 100ml and 270ml tubes; studio gouache colors can be mixed together Dries within hours according to the dilution and paper weight Can be applied on paper, bristol, and cardboard Can be diluted with water Clean brushes with soapy water