Hello, I want to make a serum to cure melasma for my 50-year-old mother, normal skin, dull face, blemish, sagging skin with wrinkles according to age. I want a liquid serum that is easy to apply, not sticky. The formula is as follows: Water 70.8 Disodium EDTA 0.2 glycerin 1 Propylene Glycol 2 Allant...