Keys to the Past

Glossary

Tap slag

Slag that is 'tapped' from a bloomery furnace. This is carried out during smelting so as to allow the long continuance of the operation. It cools to a solid slag with marked flow lines. 'Tapping' of bloomeries has been carried out since the Roman period - before Iron Age smelting formed other slag, called hearth bottoms, removed at the completion of every short smelting.

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