Rock Salt: Refining salt, Northwich Cheshire, England. Brine heated with eggs and resulting scum containing impurities removed. From the Rev. Isaac Taylor "Scenes of British Wealth", London, 1823. Hand-coloured engraving.

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 19th, century, chemical, industry, process, salt, smoke, worker, working