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Could you elaborate? According to Wikipedia it is 70%-90% alcohol.

"In a base of dilute ethanol (70–90%), eau de cologne contains a mixture of citrus oils"

https://en.wikipedia.org/wiki/Eau_de_Cologne

Well I did a better research and yea, you are right. Traditionally, all bottles have something like "80 proof" on them. Apparently, it is not English proof but French proof which is same as ABV.

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