Yes, that is just what it is, another traditional feature of the British watercolour tradition. And yes, in the past you could have sent someone round to the slaughterhouse to obtain enough to last a lifetime.It is also used by people who make marbled paper. But apart from this gory facet, why is it of use to a watercolourist?
If you use quality watercolour paper you will often find that it is difficult to cover the paper, difficult to spread your wash because the colour will not take and balls up into patches no matter what you do. Watercolour papers are often hard-sized so that the colour stays on the surface and maintains its brilliance.This is what ox-gall helps with. It is a water tension breaker or wetting agent.You can add some to your painting water and see what the results you get.It may only need a few drops.Available from reputable art stores, you don't need to go to the slaughterhouse.
If you use quality watercolour paper you will often find that it is difficult to cover the paper, difficult to spread your wash because the colour will not take and balls up into patches no matter what you do. Watercolour papers are often hard-sized so that the colour stays on the surface and maintains its brilliance.This is what ox-gall helps with. It is a water tension breaker or wetting agent.You can add some to your painting water and see what the results you get.It may only need a few drops.Available from reputable art stores, you don't need to go to the slaughterhouse.
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