Acids reacting with clays
Hi everyone hope you are doing well,
I have a little problem, today I tried to formulate an exfoliating face mask using kaolin and pink clay with and lactic acid as an exfoliant.
I prepared my water phase ( water,glycerine, LA, preservative) and adjusted the PH to around 3.6. As I started incorporating my clay mix, it started foaming and producing a very bad smell, the formula became a mess.
I didn’t know that acids can react with clays
to detect the problem I mixed separately :
kaolin + LA = foaming smelly mess
Kaolin + citric acid = foaming smelly mess( I though that maybe the problem was with lactic acid so I tried citric even though it’s not considered as an exfoliant)
I did that too with green clay and same results
But the pink clay didn’t react with the acids whether I mixed it with LA or CA, there was no foaming.
-I’dd like to know the science behind it. how come the kaolin and green reacted with those acids and not the pink clay ?
-How can I make an exfoliating mask using clays and acids together ?
-Will it do the same thing with salicylic acid?
thank you in advace!
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