Watercolor is primarily made of color pigment + Gum Arabic: The natural secretion of the acacia tree which is used as a binding agent in many liquid media. It improves the bonding properties of the ingredients in inks and watercolors, enabling them to stick to paper, and it helps to maintain a stable dispersion of pigment particles in water as the film of wash dries.
+ Ox gall: obtained from cows, used as the wetting agent, synthetic wetting agents are also available.
Gouche is watercolor pigment + opaque white pigment(often chalk) + a watercolor binder (made with gum arabic) + plasticizer(glycerin and/or dextrin) + preservative
Chalk: soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite.
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