Water color painting is really old, dating perhaps to the cave paintings of paleolithic Europe. Watercolor paint consists of four principal ingredients such as, pigments, arabic gum, additives like glycerin, ox gall, honey, and solvent. The term watercolor refers to paints that use water soluble, complex
carbohydrates as a binder.
http://www.dzineblog360.com/2011/01/water-colors-graphics-a-showcase-of-artist-peter-williams/