Product

Sweet Potato Red (SPR) is a mixture product of anthocyanins which is extracted from purple sweet potato. Anthocyanins are referring a sort of biologically active substance in plants, not only having antioxidation function, but also giving stable bright purple red color naturally. Anthocyanins changes color shade from red to purple when the environment pH changes from acidic to neutral, and finally goes to blue in alkaline. Purple sweet red has a good stability to light and heat. It comes in two forms: liquid and powder, with color value 30 (liquid), color value 40-80 (powder).