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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.
The metals of antiquity generally have low melting points, with iron being the exception.. Mercury melts at −38.829 °C (−37.89 °F) [21] (being liquid at room temperature).
Ingot molds are tapered to prevent the formation of cracks due to uneven cooling. A crack or void formation occurs as the liquid to solid transition has an associated volume change for a constant mass of material. The formation of these ingot defects may render the cast ingot useless and may need to be re-melted, recycled, or discarded.
The tinning set consisted of two pots with molten tin (with flux on top) and a grease pot. The flux dries the plate and prepares it for the tin to adhere. The second tin pot (called the wash pot) had tin at a lower temperature. This is followed by the grease pot (containing an oil), removing the excess tin. Then follow cleaning and polishing ...
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In 1985 the International Tin Council failed and there was a dramatic fall in the price of the metal. The mine struggled on for a few years, but closed in 1990, [3] and the pumps were switched off in May 1991 allowing the workings to flood. [5] The mine is not geologically exhausted of tin, but it is exhausted of tin that is recoverable ...