I face problem with Colour stability in Hair Shampoo and Body wash
pH of the final product is pH5 - pH7
I've been using
Trade Name: Cibafast H Liquid
INCI Name: Sodium Benzotriazolul Butylphenol Sulfonate, Buteth-3, Tributyl Citrate*
at this moment..only Purple colour starts to fade and the other colour still remain as day 1
I am using Food Powder Colouring in the formulation and previously I am using Benzophenone 4 as the Colour stabiliser but it is worse than using Cibafast H Liquid as Colour stabilizer. The short wavelength colour fade easily within 48 hours.
can anyone guide me with better solutions?