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Radioactive Dutch Colopal glassware. Geiger counter DRSB-01

This is a pudding mould made by the Dutch glass factory Leerdam around 1930. The glass type is named in the Netherlands as colopal. Until the posting of this video I have not found 1 hit on Google mentioning that this type of glass is radioactive. The geiger counter I use is Russian. Kvarts DRSB-01.

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