@gigabecquerel I've known people do heat shock tests, which isn't conclusive but check if it is good enough. A lot of people suggest it is close to index of refraction of mineral oil, but soda lime glass isn't that different of an index. Borosilicate glass tends to be less dense than other common glasses, but you would need decent previous to tease that out.
In a lot of places, unlabeled glass is as good as trash...
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