Question from Patreon: Does polyquaternium 10 have a shelf life" Is acetic acid or aspen bark extract a good preservative"

In the July Q&A on Patreon, Belinda asked: I have two questions...1) do you know if polyquaternium 10 has an expiration date" I've checked the website I bought it from (Personal Formulator) plus a couple more that sell it, and I've not seen anywhere if it does, indeed, expire. The reason I ask is because I'm having problems getting it to d...

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