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Updated: April 30, 2025
This substance also usually requires purification by sublimation before use. The substances usually employed for the standardization of a thiosulphate solution are potassium bromate and metallic copper. The former is obtainable in pure condition or may be easily purified by re-crystallization. Copper wire of high grade is sufficiently pure to serve as a standard.
The early references are to sugar cane and not to cane sugar. The Arabs and the Egyptians soon learned how to purify sugar by re-crystallization, and to manufacture sweetmeats from the purified sugar. Marco Polo, who visited China during the last quarter of the 13th Century, refers to "a great many sugar factories in South China, where sugar could be freely bought at low prices."
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