What is the adequate way to measure the pH of a cosmetic cream?
I’ve been looking for information about the adequate procedure to measure the pH of cosmetic creams, but I have found conflicting information on the Internet. Some state that the pH should be measured in the cream as it is, while others say that it should be first diluted with water. If the latter is the case, What sense does it make? the pH of a diluted cream won’t be the same when the undiluted cream is applied to the skin. Can you help me clarify this, please? Thanks.
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