Cosmetics Formulation Development

Ask about dissolving PPD,RL in hair dye formula. More information The amount of substance used is %W/W whereas the colorant GuarCat 10% Poly-Conditioner Eco 2% ColorFix 5% Butylene Glycol 5% ascorbic acid 0.5% Phenoxyethanol 1% PPD 0.27% RL 0.275% Add water to 100% Developer Disodium EDTA 0.1% GuarCat 2.5% Ceteareth-20 2.5% Silicone Hi-Cond 1% H2O2 10 Volume 50% Sodium Stannate 0.03% Add water to 100% by mixing all substances together. (Weigh everything together and add water) adjust the pH to 9 with Triethanolamine but there is still a problem that PPD and RL are not dissolved as before. And tried dyeing my hair samples and nothing changed, besides สีผม originally weaker only I don't know if there is any technique to recommend, for example which part of the substance should be dissolved separately first. Or there must be a sequence of substances added. Or use the temperature to help melt. Thank you.

Hello p-Phenylenediamine (PPD) is only slightly soluble in water. recommend that you consider filling Ethyl Alcohol can help dissolve more. resorcinol (RL) should be easily soluble in water. The sediment is probably PPD, not RL.