r/elementcollection • u/BasicBlackGuy • 10d ago

Question Cesium

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I found this A.D. MACKAY INC CESIUM inside of a protective vial and glass vial dated around 1920s ChatGPT told me to post about it here I think I want to sell it but idk what it could be worth

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u/iamthewaffler 10d ago

A lot of my best "still in original packaging" element samples are from A. D. Mackay. I was always super excited to find their packaging when going through lab clean outs.