Why are batch codes sometimes scratched off of perfume bottles?

Buying Guide:

This is a primitive technique, but it's still being used to this day. It's often a tactic employed to discourage resale, commonly done to tester bottles. It can also be used to camouflage the production date of items. Legally, a store is given a certain amount of time to sell a fragrance before it’s considered “expired.” For example, you could scratch the code off and sell the remaining stock without having to destroy or remove the leftover expired items and lose profits. If you find a vintage or modern perfume bottle with its batch code removed, you have to look at its other distinguishing features to identify the period in which it was made. Commonly, fragrance bottles with scratched‑off batch codes contain the exact same formula as bottles with an intact batch code.

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