Shampoo itching and scalp deposition
So i’ve been working on my shampoo formula (2 in 1 conditioning shampoo cold process). It is a very efficient formula that gives a very good after feel for the hair. However, after using the product for a while, you notice itching and some residue scalp deposition. I was thinking about the coacervation mechanism, so i tried to dilute my shampoo (1:10 v:v in water) and i noticed the formation of a white precipitate. I looked about it and it seems its the sulfate-guar reaction that is leading to the formation of this white precipitate.
Actually i’m a little bit confused, is it normal to have this precipitate? is this is the coacervate? or this precipitate is the reason of the itching and the irritation. How can i know the reason behind this effect?
I will be sharing the formula and will be very grateful for your help and opinions.
Guar hydroxipropyltrimonium chloride
Hydrolyzed wheat protein
Amodimethicone emulsion (siltech E-4177)
Salicylic acid (for ph regulation 0.3%) (also i tried citric acid but same effect)