◇ Sodium thiosulfate
◇ Ammonium Thiosulphate
◇ 45% Potassium sulfite solution
70% Ammonium bisulphite...
◇ Sodium metabisulfite
◇ Vat red F3B
◇ Vat red 54#
◇ Vat red FBM
◇ Vat blue 66#
◇ 1-nitro-2-methyl-anthraquinone
◇ 2B acid
◇ M-chlorophenol
45% Potassium sulfite solution (Photographic grade)

1, English name:Potassium sulfite solution
2, Molecular formula: K2SO3
3, Molecular weight: 158
4, Properties: Colorless and tasteless transparent liquid, has reductibility. The solution is slightly alkaline, unstable in the air.
5, Technical index :

Item
Photographic grade
Appearance
clear, colorless solution
Chroma (Pt-Co), ≤
40
Assay w/w %
44.0-46.0
PH( Tech 20°C)
9.0-9.5
Fe w/w %≤
0.001
Sulfate (K2SO4)w/w %≤
≤0.7
Thiosulfate(S2O32-)w/w % ≤
≤0.006
Insoluble matter w/w %≤
≤0.005
Density (20°C)
1.436-1.460

6, Packing:270kg plastic drum
7, Uses: Can be used in the protectant of the fixing solution or in the development on photosensitive industry. Also uses in the reductant of printing industry and the bleaching agent of wool and silk.