If there's an image to use here,
I could sure use it now.
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Mineral water has no property that
would make it useful in etching. Traditionally, etching such metals as
copper and zinc requires diluted nitric or hydrochloric acid in
combination with some other chemicals. Etchers use iron chloride, too,
which is not an acid. There are other metals and other mordants (etching
solutions) in use. Rare but worth watching is galv-etch,
a video of a Green method of electrolysis where treated water is used, plus a direct
electric current.
Maybe in that last application the idea of
mineral water came up. This is an out and out trick question. Sorry.
Please try again.
- GM
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