Tiny Mining

After one day the copper was visibly oxidised by the earliest samples. The latest urine sample did not oxidise at all. I forgot about the test strip until the 26th of November. Four days later this is the result (and underneath the initial strip):

The 22nd is still relatively untouched and while the sample from the 20th looks somewhat like I’d have expected, like copper exposed to the elements, the 19th and 17th has grown some black organic matter on top.

19th and 17th: Shiny black granules, according the Reinsch test, this could be sulphur for the speckles with selenium and tellurium and bismuth for the shiny blackness.

This was not a proper Reinsch test, just urine on a piece of (not even de-greased) copper of unknown origins.