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Cast in the shape of a peck, or dou in Chinese, each ingot weighs just over 1 pound (0.45 kg). Ten blocks made up one unit called a small bundle, and 40 blocks made up one large bundle. Details of tin production in early Malacca were recorded in the 1436 book Description of the Starry Raft by Fei Xin, a translator of Admiral Zheng He.
Tin melts at 231 °C (449 °F) [21] Lead melts at 327 °C (621 °F) [21] Silver at 961 °C (1763 °F) [21] Gold at 1064 °C (1947 °F) [21] Copper at 1084 °C (1984 °F) [21] Iron is the outlier at 1538 °C (2800 °F), [21] making it far more difficult to melt in antiquity.
The ingots are believed to have been made before 1000 BC, during the later stages of the British Bronze Age. The site was designated under the Protection of Wrecks Act on 24 November 1993. The wreck is a Protected Wreck managed by Historic England. The ingots found here are an important source of knowledge for prehistoric tin. [1]
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Evidence of direct tin trade between Europe and the Eastern Mediterranean has been demonstrated through the analysis of tin ingots dated to the 13th-12th centuries BC from sites in Israel, Turkey and modern-day Greece; tin ingots from Israel, for example, have been found to share chemical composition with tin from Cornwall and Devon (Great ...
[1]: 137 More than 160 copper oxhide ingots, 62 bun ingots, and some of the tin oxhide ingots have incised marks typically on their rough sides. [1]: 146 Some of these marks—resembling fish, oars, and boats—relate to the sea, and they were probably incised after casting, when the ingot was received or exported. [1]: 146
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A depiction of tin ingots from a 1699 map of Cornwall Tin ingot moulds outside a Cornish mine. In Devon and Cornwall, tin coinage was a tax on refined tin, payable to the Duchy of Cornwall and administered in the Stannary Towns. The oldest surviving records of coinage show that it was collected in 1156. It was abolished by the Tin Duties Act 1838.