Mixing, the truth is there is no need to purchase every colorant on the market. What is, necessary is soap stable colorants that do well when mixed. I use the term soap stable here for a reason.
A lot of people mix up the term soap stable with soap safe. As tho they are the same thing. They aren't.
Soap safe means it is safe to put in soap.
Soap stable means it maintains it's stability in the soap.
Things that are not soap safe are things that aren't safe to be put on the skin or destabilize the chemical reaction causing a lye heavy soap.
In simple terms soap on a stick doesn't mean it isn't safe. It means it accelerated the chemical process. From the standpoint of a colorant an unstable colorant usually means a color morph occurs. It can also mean it causes acceleration. These things typically mean you don't get the pretty soap you wanted. Which is why we talk about it so much.
So why do we mix the terms up.
Because there are colorants that aren't skin safe.
Not a micas are designed to be put on your skin, or certain parts of the body. Now if you are making a soap for yourself and you could care less so long as it looks the way you want. Go for it. The ethical question that often comes into play at this point is. Is it okay for you to make that decision for someone else?
I don't really have an easy answer for that. The answers I do have are. If you buy a colorant that has been through the designated process, and you get color morph it isn't because it isn't soap safe. And using color morph as a way to determine if a colorant is safe isn't safe.
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