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並前往https://chemistry.stackexchange.com/questions/94458/hcl-fingernail-set-for-a-year-h2o2-cu

HCl + fingernail (set for a year) + H2O2 + Cu [closed]

what is that blue liquid and how can I fix this to get the CuClX2 etchant? Edit: another image of the crystals formed on the copper: crystals.

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