A cursory glance through old discussions did not shed much light on browning reduction (vehicle is a pretty natural lotion) caused by inclusion of Vanillin.
Background: I am creating a mosquito lotion that includes a large amount of vanillin (3%) as a fixative. I am already using Vitamin E, Rosemary Oil extract and EDTA, each of which has helped....but not to the level I would like to achieve.
Sidebar...I have also noted considerable variation based on which emulsifier is used.
A few hours on the net last night, and I learned that sodium thiosulphate is the go to product for reducing/slowing the vanillin effect.
So question is....Is sodium thiosulphate the best chemistry to use in browning reduction? My cursory study also uncovered: Sodium bisulfite, aka sodium hydrogen sulfite as an option, as well as sodium metabisulfite.
My chemistry background is not strong enough for me to sort through these three options.
So I guess I am looking for input as follows.... Which would be the most effective.....which might pose a problem with other common lotion ingredients....and which one would or wouldn't you want on your skin?
Thanx in advance.