Sodium Dithionite is the same as Sodium hydrosulfite CAS N°: 7775-14-6. Formula Na₂S₂O₄
This is a strong reducing agent for indigo vats.
The difference for this powder is that it does not have the strong sulfur smell that comes with traditional sodium hydrosulfit.
 
For use in an indigo vat I usually use the formula of 5 grams indigo, 5 grams of sodium diothonite and 12 grams of soda ash per liter water. You multiply this per the number of liters you want your vat to be.
 
This powder is packed in a 250 gram in a double plastic ziplock bag.
 
 
Key Spec Table
CAS #
EC Number
Hill Formula
Chemical Formula
Molar Mass
7775-14-6
231-890-0
Na₂O₄S₂
Na₂S₂O₄
174.11 g/mol
 
Description
Catalogue Number
106505
Synonyms
Sodium hydrosulfite, Sodium hypodisulfite
Product Information
CAS number
7775-14-6
EC index number
016-028-00-1
EC number
231-890-0
Hill Formula
Na₂O₄S₂
Chemical formula
Na₂S₂O₄
Molar Mass
174.11 g/mol
HS Code
2831 10 00
Quality Level
MQ200
Physicochemical Information
Density
2.5 g/cm3 (20 °C)
Flash point
>100 °C
Ignition temperature
>200 °C
Melting Point
100 °C (decomposition)
pH value
5.5 - 8.5 (50 g/l, H₂O, 20 °C)
Bulk density
1250 kg/m3
Solubility
250 g/l (slow decomposition)
Storage and Shipping Information
Storage
Store at +2°C to +30°C.