USD $1.00-10.00 / Kilogram
USD $3.00-10.00 / Kilogram
USD $100.00-150.00 / Kilogram
appearance colorless crystal or white powder
assay over 97.2%
ph 10% solution 3.8-4.8
heavy metal mg/kg less 10%
so2 assay g/100g over 56.0
k2s2o2 assay g/100g less 0.1
usage: the product was used for the preparation of photographic developing solution, which was also used as food bleaching agent, preservatives, antioxidants. in addition, it could be used to retain freshness of wine, fruit juice, beer clarifying agent, fruits and vegetables, meat, graps, as well as the non-cyanide silver plating.