18 x 12 ml (0,4 US.fl.oz) (Titanium white, crimson red lake, vermillion, lemon yellow, viridian, pale green, cerulean blue, Prussian blue, mauve, yellow ochre, burnt sienna, lamp black). Gouache is an opaque paint that produces smooth washes with good coverage. Use the colours full strength for bold opaque coverage or mix them together for more colour tints. Use a silk sponge to wet the paper. Colours will spread easily and will appear fuzzy. Clean brushes with luke warm water.