Roman Alum From Roasted Alum Stone: Weathered a Month, Boiled and Crystallised in Wooden Vessels (Tomlinson, 1854)

The Tolfa way of making Roman alum, from Tomlinson's Cyclopaedia of Useful Arts (1854): alum stone roasted twice over a wood fire, kept wet for a month until it falls to powder, boiled in water, settled, and crystallised in square wooden vessels that come apart, with a second crop from the mother liquor.

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Alum (Potassium Alum)

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1,697

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