Tartaric acid combined with calcium carbonate produces an effervescent reaction. If mixed with natural earth pigments, the effervescence optimizes the coloring properties of the pigment and facilitate its dispersion. (See Effervescent Earth Pigments)
Tartaric Acid is also used as a mordant in dyeing.
Tartaric acid is a white, crystalline organic acid: HO2C-C2H2(OH)2-CO2H
Warning: Harmful Irritant