1. A metal-plated molded replica of a relief printing plate, produced electrolytically.

It is used for long press operations.

2. A reference to a duplicate printing surface prepared by making a mold of the type page or halftone plate, then by suspending this mold in a bath of copper sulfate and sulfuric acid so that, by electrolytic action, a thin shell of copper is deposited on it, and finally the pouring of molten type metal into this shell in order to strengthen it for use on a printing press.
3. A duplicate of a block of type or engraving made by electroplating a wax, lead, or plastic mold of the original or an item that has been printed from an electrotype.