Virtual Museum

Tap slag

Tap slag
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This dense slag comes from a bloomery furnace used for smelting iron from ore. As the temperature in the charcoal-fuelled furnace rose, the ore would begin to melt, but the first molten material that dribbled to the bottom of the furnace was not the iron itself. This hot liquid was vented tapped off in small rivulets and left to cool before being hacked away and discarded.

More than 3kg of this type of slag was excavated from a 1 cubic metre test pit, and similar material has been found in nearby gardens, indicating the likelihood that this site saw the firing of numerous furnaces over a period of time. The Iron Age date is tentative, and is based on the identification of a single sherd of pottery (haematite coated ware) excavated from the same source as this artefact. Finds resembling this may date from the Iron Age to the Tudor period.

Material: metal

Period: Iron Age

Find spot: 13 West Town Lane, Brislington, Bristol. ST 62097032

Exhibit contributed by Alan & Margaret Bale

Text written by Ken Taylor, in 2011

Photographer: Steve Hallam

Acquisition number: 110904a1

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