Hi, first of all happy to be here, this is my first post and I'm looking for some advice and hopefully to share my finding on creating colloidal low viscosity serums, perhaps analogous to liquid spray on sun screens
Create a stable oil in water emulsion where the zinc oxide remains in colloidal form (not settling on the bottom), thin enough to be applied with a dropper. No "shake before use" required.
Example simplified recipe
5% Zinc oxide (does micro ionized version work better?)
5% Vitamin E acetate
1% Essential oil
So what emulsification and thickener system could work to achieve this? Perhaps some combination of Schlerotic Gum and Cetyl + Ceteareth-20? Could polyacrylamide work?