Lac Dye Red
The appearance of normal lac dye red is bright red powder, can dissolve in ethanol and propanediol, slighty dissolved in water, not in cottonseed oil. The appearance of water soluble las dye is brown powder, and can completely dissolve in puified water. The color shade of water solution changes when PH is different.When PH is between 3-5, the color is reddish orange. Red to purplish red color when PH is between 5~7, it is purplish red when PH is more tahn7.It has excellent resistance to high temperature in and acidic medium, but not in alkali medium. It can be influenced by metal ions, especially ferric ion.