Cosmetics Formulation Development

I tried mixing สีละลายน้ำ into the gel and it came out reddish brown. But after leaving it for a while overnight, it turns out to be green. And in this baking, what substance do we need to add? to keep the color stable, thank you

You can use Protec™ UV ( Benzotriazolyl Dodecyl p-Cresol ) or Protec™ SQ Can I or not?

Hello, to increase the stability of สีละลายน้ำ 1. Use Benzophenone-4 at a rate of approximately 0.1-0.5% (test to see if any level is sufficient) 2. Check Check the pH of the formula. It must not be too acidic. and not alkaline

Benzophenone-4 I see that it's out of stock. I don't know if I can use a niche instead.

Hello, you can use Ensulizole ( Phenylbenzimidazole Sulfonic Acid ) Phenylbenzimidazole Sulfonic Acid , but you need to test it. Please check the proper pH according to the instructions on the product detail page.