Here's a guy whose rejuvenation chemistry has allowed him to use the same ferric chloride etchant for four years (watch that chlorine gas, though): http://www.qsl.net/iz7ath/web/02_brew/14_howto/02_clor/index.htm BTW, has anyone ever tried this (add citric acid to etchant)?: FERRIC CHLORIDE AND THE EDINBURGH ETCH http://www.lawrence.co.uk/acatalog/etch.pdf
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Re: Rejuvenating ferric chloride etchants (was: Darkening laser printer toner?)
2012-03-20 by sheldon_mp_cooper