Ox-gall is a suitable levelling agent for watercolours, producing a smoother free flowing wash, but should be used sparingly to avoid strong absorption of the paint. It can also be used on very hard sized paper to reduce surface tension, as well as being used to degrease grounds other than paper. It can be applied directly (with a brush or cloth) to the substrate, or added sparingly to the watercolour or wash water.
It produces interesting tendril-like patterns when gently introduced to already applied damp watercolour and enhances colour bleed in to the wash water (an example is given in the painting above). Dissolved ox-gall tends to flocculate over time, but this has no influence on its application.
|Brand||A J Ludlow|