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

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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…

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