Holbein Irodori Artist Gouache - Indigo, 15 ml, Tube Indigo 15 ml (0.5 oz) Holbein Irodori Artist Gouache is a series of premium opaque watercolors offering outstanding handling and excellent ratings for lightfastness. Each color in the series draws inspiration from both history and nature, allowing artists to experience the rich beauty and delicate expression of Japan in the spring, summer, autumn, and winter. Conforms to ASTM-D4236. - Holbein Irodori Artist Gouache - Indigo, 15 ml, TubeHolbein Artist Gouache, IRODORI INDIGO 15ML -