Winsor & Newton have been producing Designers Gouache since 1935 and to this day we continue to offer the finest artists' gouache range available. Designers Gouache colours are a range of opaque water colours, mainly used by designers, illustrators and commercial artists to create vibrant illustrations in solid colour. Gouache is also widely used in fine art as an opaque water colour. Today the Designers Gouache range benefits from significant developments in technology and is smoother, flatter, more opaque and more brilliant than ever before. Process Red is a bright violet red gouache colour. It is one of the basic primary colours and is semi-opaque.