@aryl Definitely looks like a copper salt with that intense blue although i couldn't tell you the exact one... Nitrate or sulfate are both plausible?

@aryl but it could be something more exotic like cobalt chloride too

@azonenberg Correct!

@azonenberg though CoCl2 being referred to as exotic is really funny to me

@aryl well I mean compared to something like copper nitrate that i make (and throw out as waste) almost every time i use my wet bench