This 2 ounce bottle of Synthetic Gall by Jacquard can be added to Jacquard Marbling Colors to increase spreading. Gall should not be added directly to any of the paint bottles as you cannot decrease the amount a color spreads once the gall is added. Instead add on drop at a time in a secondary jar or palette until the color spreads as desired. This allow you to make one color dominate over the others or to increase the coverage on the marbling surface. Gall can also be diluted and used to create voids in the design and can push the colors into tight veins.