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Why Sulfate free Shampoo changes color?
I am making sulfate free shampoo with violet color in it. The color after 6 weeks stability goes from purple to grey. Ph range is 5 to 6.6. Tried chelators already, and UV filter as per supplier. Any suggestions?
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2 Replies
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You’d have to list your formula ingredients if you want any good suggestions.
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Sorry… thanks for making me laugh. “Violet” eh? Sulphate free, eh?
Let me tell you a little story.
Once upon a time I designed a sulphate free shampoo. It was based on an Akypo surfactant, a carboxylate that was anionic or cationic depending on pH. And a couple of secondary surfactants, CAPB and whatever.
I went to one of the local factors to buy fragrances and dyes and thought, this violet one will be cute for my sulphate free shampoo.
And it was very cute. And the fragrance was, too.
I made a batch of about 40 and took them to a farmer’s fair type event.
It was a nice sunny day.
You’re already ahead of me aren’t you?
I knew it.
So, hardly had I arranged all the 400mL Eurostyle bottles of shampoo on the display, than the sun came out, and kind of like a wave, they all changed colour, in minutes, from violet to a kind of olive green.
It wasn’t muddy or unattractive, fortunately, but it did clash with the label.
Just treat your experience as a life lesson and don’t try for violet, is my advice. Only the royals can pull it off.
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