Ox gall
Ox gall (also spaced oxgall) is bile, also known as "gall", usually obtained from the gallbladder of cows, it is an ingredient in bile soap and mixed with alcohol and used as the wetting agent in paper marbling, engraving, lithography, and watercolor painting. It is a greenish-brown liquid mixture containing cholesterol, lecithin, taurocholic acid, and glycocholic acid.
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