20ml tube. Moves, reacts, blends and feels like traditional gum arabic gouache. Water resistance once dry. Drying to a velvet matte finish; Holbein Acryla Gouache does not shift in colour tone from liquid to dry colour. What you see wet is what you get once dry. Holbein Acryla Gouache does not have the same fragile surface as traditional gouache in gum arabic and is compatible with all other water soluble media regardless of origin.