Holbein Ox Gall Watercolour Medium - 60 ml (2 fl.oz.)

Holbein Ox Gall Watercolour Medium - 60 ml (2 fl.oz.)Holbein Ox Gall Medium is an artist-grade wetting agent that improves flow and enhances wet-into-wet techniques when mixed with watercolors. It also improves the acceptance of watercolor on paper, particularly hard-sized papers. Available in 60ml squeeze bottle.