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Neutralize yellow-ish color on a shampoo
Hello!
Recently, I’ve been working on a sulfate-, paraben-, silicone-, and salt-free shampoo. I already have a final formula that I’ve been testing for a while, but I encountered an issue: my customer wants it to have a pearly white finish before adding the final color.
I’m using 2% Euperlan® PK 3000 AM (Glycol Distearate, Laureth-4, and Cocamidopropyl Betaine) to achieve this effect, but the shampoo still has a yellowish tint. I considered increasing the percentage of Euperlan to around 3–5% or adding a purple colorant to neutralize the yellow tones. However, I’m not entirely comfortable using a colorant if pearly white is not the final color.
Do you have any suggestions for achieving a pearly white finish without these options (considering my customer will add color to the shampoo after i sell it to them)?
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3 Replies
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Have you identified which ingredient is causing the yellow tint? Could you try adding a small amount of titanium dioxide to the formula?
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Hi! Yes, I have them identified. Quite a few of my surfactants are yellowish, as well as some proteins and my amino acid blend. On their own, they aren’t as yellowish, but blending them together gives the mixture a yellow tint. I did think of adding titanium dioxide i just wanted to see if anyone else had an alternative. But thank you very much i think i’ll try it out and see how it turns out.
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Usually that yellowish color comes from some residual amines. You can try lowering the pH (make few samples decreasing the pH and compare them to see if it improves the color). Also, usually adding a dye solves the issue (I wouldn’t be so worried to have a yellowish tone before adding a dye).
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