Saltwick Nab is a full bodied dark ruby ale manufactured by the Whitby Brewery.

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It is named after the alum quarries in Saltwick Bay at Whitby. An alum is a type of chemical compound, usually a hydrated double sulphate salt of aluminium. The quarries are now closed but they are protected as an important site for fossils. https://en.wikipedia.org/wiki/Saltwick_Bay