Sodium metabisulfite is the substance of an inorganic salt. It is also known as sodium pyrosulfite and disodium. It is in solid state under the normal conditions. Its general appearance is powder-colored or white. Sodium metabisulfite melts at 150 degrees celcius. In addition, it has been used for food preservation for many years. There is any harm to the human body when consumed with foods. Therefore, to be used as an additive in foods in many countries including the U.S.A was released.

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