OMV 75ml Ox Gall Liquid Ox Gall liquid is a wetting agent and is used to improve flow when mixed directly with water colours.
How is it used?
A few drops of Ox Gall are added to a jar of water and this is used to dilute the water colour.
Ox Gall is also used on very hard sized papers to reduce surface tension. If a paper is resisting a water colour wash, leave it to dry before covering the paper with the diluted Ox Gall. Once this is dry the painting can be continued as normal.
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