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makeda ylma
How do I dissolve hydroquinone powder to make a 20% and 10% concentration?   I'd like to make 4 oz. I would like to add retinol and kojic acid to it as well. I'd like the consistency to be thin like a gel so that it absorbs quicker. Lastly, I'd like to add benzoic acid for preservation purposes.   I understand the concentrations
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