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Description: | Cast copper alloy ingot or 'cake', oval in plan, and almost plano-convex in profile and section, but with an uneven base from the solidified lumps of molten metal. The upper surface is smoother but still has many deep circular pits. The molten copper alloy would have been poured into a mould with a slightly rounded base, echoing the curvature of this upper surface, and allowed to cool until it was solid. The undulating lower surface represents the formation of air pockets, the largest one of which seems to have burst. The colour, texture, shape and formation of the ingot suggests that is at earliest Medieval in date (Dr. Peter Northover pers comm). Without metallurgical analysis it is difficult to date the ingot any more than this.Egan (2005) illustrates a similar plano-convex antimony ingot on page 148, Fig.141, No.784, which is dated from c.1575-1600 from its context, but antimony was frequently found as a constituent of medieval copper alloys (ibid, 148), and one of its main sources is Cornwall.
Original Image | Publisher: | http://finds.org.uk | Source: | Portable Antiquities | Identifier: | http://finds.org.uk/database/artefacts/r... | Go to resource |
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