Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Has anyone used lye to etch aluminum through photo resist?



As a test, I put a strip of aluminum in lye plus water and after 15 minutes
the strip was half of its original thickness. So there is no doubt that lye
can etch VERY deep. But the chemical reaction generated a lot of heat and
the tape I had on there quickly floated off. Next time I will use more
water.



I did have the lye and aluminum outside while I watched from inside. Nasty
fumes!



Thanks,



Rick



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