What's the noun for electrotints? Here's the word you're looking for.
electrotint
A style of engraving in relief by means of voltaicelectricity. A picture is drawn on a metallic plate with some material which resists the fluids of a battery; so that, in electrotyping, 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.
“The innovation of electrotypes in the mid-19th century added yet another dimension to the art of copying.”
“Wax is used as the plastic medium in which to mold electrotypes, whereas for stereotypes paper is used.”
“Ring manufacturers participated in the campaign through radio advertising and by sending out newspaper electrotypes to be used by jewelers across the country.”