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Color fades completely off in shower gel
Hello,
I have this weird color stability problem with my shower gel. In my formulation I use 1 % solution of these colors: CI 17200 (0,066 %), CI 14700 (0,0195 %). I know it’s not very good if the color is not very intense, but my formulation contains 0.1% Benzophenone-4 and the bottles contain 1% anti-UV protection. The problem is that from one batch of shower gels, the color faded completely off only in some of them. I thought the problem was with the bottles, but the manufacturer denies that there is anything wrong with them. Would anyone please know what else could be causing the discoloration in only some samples?
Thank you very much for any advice.
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3 Replies
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Did you check if there was a pH drift in the bottles that showed discoloration compared to the others?
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Yes I did, the pH remains the same. In the beginning the pH was 4.9, now is 5.0. I guess it’s not much of big difference.
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If you have access to a UV spectrophotometer you can check if your bottles contain the UV blocking additive. Run a scan on a piece of one of the UV additive bottles and compare that to a standard bottle. You will see a difference in the UV region of the spectrum.
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