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Chemical PCB etching without the toxic waste td Sun Dec 3 17:17:46 2017
I don't like the idea of making printed circuit boards at home because the chemicals involved are moderately toxic and hard to dispose of legally. But I may have to change my mind. Stephen Hobley has found a simple combination of non-toxic chemicals, available in a grocery store, that appear to do the job. Described here and here.

Found here on Hack a Day.