Weekend Wonderings: Product contamination and jars, cetyl alcohol and substantivity, and freezing our ingredients

In this post on how much cetyl alcohol to add to BTMS-25, Rosi asks: Will our leave in conditioner get contaminated if we keep sticking our hand into it and applying to hair?Maybe. I’m always apprehensive about sticking my hand or fingers into any of my products because you never know what is lurking on even…

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