Carminic Acid

Name:
Carminic Acid
Detailed information:

M Formula:	C22H20O13
Properties:
Dark, purplish-brown mass or bright-red powder. Mp (decomposes at 136C), pH 4.8 (yellow), pH 6.2 (violet). Soluble in water, alcohol, concentrated sulfuric acid; insoluble in ether, benzene, chloroform. Combustible.
Derivation:
By extraction from the insects Coccus cacti (cochineal).
Use:
Stain in microscopy, indicator in analytical chemistry, coloring proprietary medicines, pigment for fine oil colors, color photography, dyeing.