PAO and Expiration Date
I hope that someone can enlighten me on this…
As per uncle Google;
In cases where the shelf life exceeds 30 months an expiration date
is not required to be placed on the packing, however a period after
opening (PAO) is
My question is; how do I determine the shelf life of makeup? is it by running stability of unopened product over 30 months? If it passes then there is no need for an expiration date (just PAO) and if it fails I need it + I also need PAO? Also, how do I determine PAO? What kind of testing do I need? Is it the same type of testing as for the expiration but using previously opened pieces? or maybe is there a set PAO for certain type of products i.e. 12m for lip glosses?
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