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It is mainly used as fixing agent in photographic industry. Secondly, it is used as the reducing agent of dichromate in leather tanning, the neutralizing agent of nitrogen-containing exhaust gas, the mordant, the bleaching agent of wheat straw and wool, and the dechlorinating agent in pulp bleaching. It is also used in the manufacture of tetraethyl lead, dye intermediates and the extraction of silver from ores.
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