1, in the production of white sugar, there is a process called decolorization, that is, decolorization of sugarcane juice. The methods of decolorization include sulfurous acid method, monocarbonate method and bicarbonate method. The white sugar made by the decoloration process of bicarbonate method is called "double carbon sugar".

2. At present, the domestic sugar is basically decolorized by sulfurous acid, which requires sulfur in the production process. Therefore, the white sugar produced by sulfurous acid method has a certain amount of sulfur dioxide residue, while the bicarbonate process does not use sulfur, so the bicarbonate sugar does not contain sulfur dioxide.

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