Vitamin C Serum - Ferulic Acid Crystallizes
I keep on trying to making a Vit. C serum that I can use http://chemistscorner.com/cosmeticsciencetalk/discussion/3413/combination-of-geogard-221-leucidal-liquid-sf#latest and I have tried to simplify it as much as possible.
Last weekend I thought I had found the perfect/good enough for me recipe for a 30ml bottle:
Distilled Water 20 grams
L- Ascorbic Acid 4 grams
Ferulic Acid 0,5%
Sodium Hyaluronate (RMW) 0,2%
1,3-Propanediol 2 20%
Green Tee Extract 1%
Xaromix or Geogard
I have had problems
dissolving the Geogard in the past, so this time I went for the Xaromix.
Everything seemed good, but after two days, small long filaments could be seen in the bottle. I had seen them before, so I knew that it was the Ferulic Acid. My question is, why? I mixed it with Propanediol and warmed it up to 70ºC and I did not use anything metallic.
Thank you very much in advance,