Slag
Archaeometallurgy, Guidelines for Best Practice, published by Historic England in 2015, defines slags as: ‘… vitreous waste products of many metalworking activities. Slags can be produced during smelting, refining, smithing and even during casting of metals. Most ores contain unwanted components (eg silica) and these are removed during smelting as a slag. The size, shape and composition of slags are related to the processes that produced them.’
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