2. ↑ Dipropylene Glycol. Dipropylene Glycol is used in skincare and cosmetics as a/an that masks the scent of other ingredients in a formula aka masking, fragrance, solvent to dissolve things in a formula, viscosity controlling ingredient.
4. ↑ propylene glycol ( Propanediol ) solvent; humectant; gives a product “slip”; helps “carry” other ingredients into the skin; also enhances the efficacy of preservatives; controls viscosity