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30DaysToBecomeABetterCosmeticChemist_cover (1)

Bill_Toge

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Bill_Toge
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  • Khadijah
    Thanks for the EXTREMELY useful advice on testing the henna for metllic salts. Much appreciated. I am a chem engineer but have been out of the straight chemistry for a while doing process work so it's taking me a little while to ramp back up.

    Take Care
    March 8