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About 2 months ago, I decided to try my hand at a simple gel recipe for personal use, which for a short while seemed like a success. The product initially looked exactly like I imagined which was a transparent gel. I stored it in two different packages, a 50 ml airless pump and a 5 ml plastic jar and all seemed well. However, after a few weeks, maybe 2, I started to notice a slight color change. The product in the jar suddenly had an orange tint to it while the product in the airless pump did not. Today the color change is even worse; the gel in the jar has completely solidified and the tint has turned into a burnt orange color. The gel in the pump is also darkening as well at this point. Does anyone have an idea of what might be happening? My main theory is that it’s oxidation but I’m not quite sure. I even included disodium EDTA in the formula to combat just that but maybe it’s present at a too low concentration. If it is oxidation which of the ingredients is most likely to be the culprit?
PROCESS: I started by heating the water to 70 degrees and added hydroxyethyl cellulose while mixing. After the gel hydrated and cooled to 40 degrees, I added niacinamide, n-acetyl glucosamine and disodium EDTA, all of which dissolved nicely. For the last step I premixed glycerin and EUXYL PE 9010 (phenoxyethanol and ethylhexylglycerin) and then added it to the gel.