- Purple sweet potato powder is red to pumple red, liquid is brown purple, both has the characterstic odor sweet
 potato. It can be dissolved in water alcohol, propylene glycol solution easily, but nat int oil. The color of water
 solution changes when PH is different When PH is between2-6, the color is red or purple red The solution color
 becomes blue and is unstable when PH is above 6. The color of solution can' t fade under light for a long time,
 and also has good resistanoe to high temperature in an acidic medium.
 -Features
 1. Antoxidation, antimutation and liver protection.
 2 Strengthen body physigues
 3. Lose weioht and fit. and even anticancer.
 4. It is becoming the optimum food owning to its non-pollution, green and organism characteristics
 5. Purple Potato embody affiuent nutrition of Selenium and anthocyanidin.