Unit count 154.0 millilitre. Winsor & Newton, Designers Gouache, Introductory Paint Set, 10 x 14 ml Tubes Assorted Colours and, Designers Gouache, 14ml Tube - Permanent White. Paint type Gouache. Product 1: Designers Gouache is a range of opaque colours and ideal for creating vibrant illustrations and design work because it dries quite quickly and is also ideal for digital scanning because it is non-reflective.