There has been much activity in the art of multi-color printing. A single inventor, Mr. Edward Hett, took out, during the years 1899 and 1900, 76 patents for machines and methods especially intended for multi-color work. The salient feature of Hett’s invention is an electrolytically deposited printing surface of zinc which can be developed and used like an ordinary lithographic stone. The coating of zinc is deposited upon a permanent base and after having been used can be removed by mechanical or chemical agencies without disturbing the base. The following patents to Hett are referred to: 637,560, 637,561, 637,568, 637,596, November 21, 1899; and 662,854, November 27,1900.
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