That might seem like a strange title compared to how adamant I am about stability, but I have been thinking. I know some (*cough* formulators) who only stability test for two weeks (if that) before sharing a formulation. It got me thinking, how stable do we need our formulations to be? Are there acceptations? That is what I wanted to discuss in this post. 

Let's meet a new ingredient Behentrimonium chloride (BTC). For full disclosure, the ingredient was sent to me for free from Crafting Cosmetics in exchange for a review. I have purchased from them before. I have to say, I am impressed with Crafting Cosmetics. Shipping is quite fast and the best price that I have seen. Their ingredients are not expensive and it is not a massive investment of money when you just want to see if you even like an ingredient. It is also a cosmetic chemist-owned brand. I appreciate all the SDS and certificate of analysis. They are a US based supplier. Just to clear this up before anyone gets confused. The owner and I both have the same first name. I do not own Crafting Cosmetic. 

I learned the answer to this from my organic chemistry lab. One of the techniques we used to determine the purity of a product is to do a melting point determination test. We would take out sample and add it to a capillary tube and then add it to a machine that would melt the sample. There was a view finder so we could see the product melting. 

I wanted to make a quick post on why I use multiple waxes in formulas.
There are two reasons that include multiple waxes in a formulation: their melting points and crystalline structures. Let me explain.

One of you asked this question. Feel free to post your questions on the member-to-member blog post.