Question: Why are we using preservatives in salt or sugar scrubs?

In this post, Sarah asks: One thing I’d like to know is the specifics as to why we preserve anhydrous sugar and salt scrubs – I’ve had so many discussions with regards this (I say we should, to be safe) and would like it clarified if poss.! I know you’ve touched on it before but could...

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Cationic polymers: Polyquaterniums

I’ve written about polyquat 7 and honeyquat before, but let’s take a look at those polyquaternium ingredients along with a few others! So what is a cationic polymer? A polymer is “Any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively...

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An aside…cetearyl alcohol

Since my first experiments with cetyl alcohol and stearic acid were a bust, I thought I’d turn to another fatty alcohol – cetearyl alcohol! (And you’ve seen how well the other two ingredients worked out!)  Cetearyl alcohol (also known as cetostearyl alcohol and cetylstearyl alcohol) is a blend of cetyl and stearyl alcohols that we can use...

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Better crafting through chemistry: Sorbitol

In this post on humectants, Aesthete asks: I was re-reading this post on humectants and was wondering if you’ve ever formulated with sorbital? It’s described as having “excellent plasticizing & thickening effects providing viscosity & texture, stabilizes gels & provides good clarity, effective moisturizing properties, good smoothing & conditioning effects.” It almost sounds too good...

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Chemistry: Refractive index

All materials reflect and refract light, which is to say all materials alter the angle of light. The refractive index is a ratio defined as the speed of light in a vacuum (which equals 1) over the speed of light in the material. Light slows down when it enters a substance, so every refractive index...

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