Synthetic ox gall Maimeri Blu 75ml Ox gall is a wetting and leveling agent used in the watercolor technique to improve pigment dispersion on paper and reduce the surface tension of water. This modern ox gall is made from sodium or potassium salts of animal or vegetable fatty acids. It is a product commonly used by professional and amateur watercolorists to improve the quality and appearance of their watercolor works. When added in minute amounts, it improves pigment dispersion on paper and adds a shimmery, luminous effect to paint. It is recommended for preparation in the "wet on wet" technique. Does not affect the inks used. To apply the Maimeri Ox Gall 75ml product, follow these steps: Shake the bottle well before use to ensure the product is well mixed. Add a small amount of product to a container of clean water and gently shake to mix. Use a brush to apply the product to the paper before you start painting with watercolors. The amount you apply will depend on the surface of the paper and the concentration of pigment you use. Once you've applied the product, let it dry for a few minutes before you start painting. It is recommended to use it on high quality watercolor papers and in the wet-on-wet technique for best results. Brand: Maimeri.