Vulcaniteジュエリーベア
Vulcanite is a substance formed by combining sulphur and India rubber, a natural rubber, and then heating - or vulcanizing - the mixture. It becomes a hard, black material, originally intended to take the place of ebony wood. Charles Goodyear is generally given credit for developing the process and his patent occurred in 1844.
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In 1826, Thomas Hancock presented his findings on latex to the Royal Institution in London, as a result of which Michael Faraday, the most influential scientist of his era, published a report on
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