What is High purity Vc?

Vitamin C is soluble in water, it is easy to be oxidated by oxygen, hot, ultraviolet rays, leading to color into coffee, and producing a similar to sugar metamorphic after the unpleasant odor, and thus could not be used in cosmetics. The scheme or without water development water soluble or fat soluble VC derivatives of stable VC derivatives get into the only free VC can play a role. High purity VC has reliable, even if the stability of the system contains a lot of water, can still be stable VC10 % or higher.