On October 12, Hunan's quotation for sodium metabisulfite was 1600 yuan per ton. The specifications of sodium metabisulfite are: Usage level: Industrial grade; main content (calculated by Na2S2O5), ω/% ≥: 96.5. The validity period of the quotation is 3 days. Quotation provider: Guangzhou TianYue Chemical Co., Ltd.