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MONUMENT NO. 29279

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Alum house recorded as 'ancient' in 1817 when remains of furnaces, boilers and cisterns were visible. The site is called '?allome garth' on a 1636 plan of the Egton Estate, but only trees are depicted suggesting the site may already have been out of use at that date. In an alum house, aluminium sulphate solution was concentrated by boiling in evaporating pans, and an alkali, derived from human urine or burnt kelp, added to cause precipitation of alum crystals. The crystals were then bagged and transported for sale.

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