Can high purity glycerin be used directly? Below dry condition cannot absorb skin moisture to burn skin easily?
Many people think of glycerin as an oil because it has a word in its name.
Glycerol is sticky, it's thick, it looks like an oil, but it's not an oil, and if you look at the chemical molecules, it's alcohol, and it's in the same class as alcohol.
Glycerin is not an oil, but it binds too tightly to the oil. We are exposed to a variety of vegetable oils. Animal fats contain high Numbers of glycerin. Fatty acids, saturated fatty acids, unsaturated fatty acids, essential fatty acids, etc.
We don't care what fatty acids are made of, have you ever wondered why these oils are made of fatty acids instead of oils?
The oil is hydrolyzed into two parts fatty acids and glycerol, in other words, oil (vegetable oil, animal oil) = glycerol + fatty acids so glycerol is abundant in plants and animals and in our bodies.
Glycerol is particularly widely used in food, medicine and cosmetics for two main purposes
1) Slightly sweet, used as a sweetener
2) It is hygroscopic and used as a humectant