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Thinking about making something else out of my 19th century metal precipitates a question ‘what are my artefacts made of?’

I’m not sure it matters, but I really want to know. I can guess from looking that they are probably nickel and some are silver plated. Some have products of corrosion on them which will be different again.

I make contact with the chemistry department of a nearby school and talk to them about making chromatographs out of a solution containing the dissolved objects.

I cut up the pieces into small bits and take them to the lab.

I keep finding bits everywhere