I usually purchase mine premixed and can be purchased through a few
1) Electronic stores that specialize in building your own circuit
2) http://www.zacryl.com/ My personal favorite because all they do
3) The ratios vary with the strength you require, but I would make
it 6 parts water, one part ferric chloride. Make a few tests. If it
doesn't etch quickly enough, add a little more ferric. The issue can
be the water in your area.
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Jewelry/Metalarts School & Cooperative Studio