Winsor & Newton Ox Gall Liquid Watercolor Medium

Winsor & Newton Ox Gall Liquid Watercolor Medium is a wetting agent used for smooth washes and to enhance flow when mixed directly with watercolor. It reduces surface tension, making it a useful medium for use on very hard-sized paper.

It is recommended to add 3-4 drops of this watercolor medium per cup (8 fl oz) of water, mix, and then apply to your painting surface.