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photozincography
Photozincography, sometimes referred to as Heliozincography but essentially the same process, known commercially as zinco, is the photographic process developed by Sir Henry James FRS (1803–1877) in the mid-nineteenth century.
This method enabled the accurate reproduction of images, manuscript text and outline engravings, which proved invaluable when originally used to create maps during the Ordnance Survey of Great Britain during the 1850s, carried out by the government's Topographical Department, headed by Colonel Sir Henry James.〔Proceedings of the Royal Geographical Society of London, 1859–1860; Vol IV, Session IV: Earl De Grey’s Address; pages 109–210〕
==Basis==
The foundation of this method is the insolubility of bichromate of potash upon exposure to light, allowing the printing of images on to zinc from photographic negatives.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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