DIY Tips and Info I know this is a lot of information, but I hope it helps those looking at trying their hand at DIY. Keep in mind, This is just my own experience. PG- Propylene Glycol : It is a colorless, nearly odorless, clear, viscous liquid with a faintly sweet taste, http://en.wikipedia....ropylene_glycol VG-Vegetable Glycerin(Glycerol): In foods and beverages, glycerol serves as a humectant, solvent and sweetener, and may help preserve foods. http://en.wikipedia.org/wiki/Glyc