The appearance of normal Lac Dye Red is bright red powder, can dissolve in ethanol and propanediol, slightly dissolve in water, not in cottonseed oil. The appearance of water soluble lac dye is brown powder, and can completely dissolve in purified water. The shade of color solution is different when PH changes, it’s reddish orange when PH is between 3～5,red to purplish red color when PH is between 5～7, it’s purplish red when PH is more than 7.It has excellent resistance to light and heat in acid medium, but not in alkali medium. It can be influenced by metal ions, especially ferric ion. Before using water soluble Lac Dye Red, appropriate quantity of purified water must be used for dissolving Lac Dye Red before adding into food or beverage.