Daler rowney simply gouache set daler rowney 126600924 the daler rowney simply gouache set is an affordable collection of 24 colours which can be used to paint on all conventional watercolour surfaces gouache paint is used by designers illustrators and commercial artists to produce vibrant illustrations and in fine art as an opaque water colour all colours in the simply gouache range have been formulated to give opaque colours with strong covering power daler rowney simply gouache 24 x 12m