Red grape skin color Red grape skin color is natural edible pigment extracted from the grape skin. Its main ingredient is anthocyanidin pigment, including oenins, syringidine etc. The product is dark purple powder. Itf+s easily soluble in water and ethanol water liquor, not soluble in grease and anhydrous alcohol. Its hue and stability are affected by ph value: it appears stable red or amaranth when in acid condition; blue in litmusless condition; dark blue in alkalescent condition. Packed with bag of aluminum foil inside and carton outside. We can also pack with the request from clients.