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Ox gall

Ox gall is gall, usually obtained from cows, that is mixed with alcohol and used as the wetting agent in marbling, engraving, lithography, and watercolor painting. It is a greenish-brown liquid mixture containing cholesterol, lecithin, taurocholic acid, and glycoholic acid.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ox_gall". A list of authors is available in Wikipedia.
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