Amount of microbes in a cosmetic product
In PET test they add 10^6 cfu/g of bacteria and fungi to a product and see how much of that will be killed by preservative and in how much time.
My questions are
1. Why 10^6 cfu/g?
2. If i product doesn’t have preservative, how much microbes can grow in it at maximum in cfu/g?
3. Up to How much microbes are safe in a product and above that are not safe for human use or product stability in cfu/g?
4. How much microb is 10^6 cfu/g approximately? For example can we see 10^6 cfu/g mold or yeast by eye or at how much microbes a visible change in color or smell of a not fragranced and colored lotion can be seen?
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