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Electro-tint

Definition: A style of engraving in relief by means of voltaic
electricity. A picture is drawn on a metallic plate with some material
which resists the fluids of a battery; so that, in electro-typing, the
parts not covered by the varnish, etc., receive a deposition of metal,
and produce the required copy in intaglio. A cast of this is then the
plate for printing.