Sodium sulfide (anhydrous)
CAS 1313-82-2 · EC 215-211-5 · Na2S
Also known as disodium sulphide
Handle chemistry safely
Wear gloves and eye protection, work with good ventilation, and read the supplier’s safety data sheet before use. Hazard information here is a summary, not a replacement for it. Dispose of all photographic chemistry correctly, in line with local laws and your local authority’s guidance. Never mix waste solutions, and check the supplier’s safety data sheet before disposing of anything.
Hazards
Official EU classification (harmonised under CLP Annex VI).
Signal word: Danger
Acute toxicity · Corrosive · Hazardous to the environment
- H311 Toxic in contact with skin.
- H302 Harmful if swallowed.
- H314 Causes severe skin burns and eye damage.
- H400 Very toxic to aquatic life.
UK and EU rules
- UK Poisons Act 1972: REGULATED poison – sodium sulfide (CAS 1313-82-2), no threshold stated – also within reportable "metal sulfides" entry (GOV.UK list of chemicals)
Photographic uses
- sepia toner (T-7a redeveloper)
Used in: Kodak T-7a sulfide sepia toner
Sources
- ECHA CHEM substance record: Disodium sulphide (100.013.829)
- ECHA CHEM – C&L Inventory (harmonised CLP Annex VI and notified classifications) and legal obligations (chem.echa.europa.eu APIs: /api-cnl-inventory/harmonized|industry, /api-obligation-substance/v1)
- Supplying explosives precursors and poison substances: list of chemicals (supplying-explosives-precursors/list-of-chemicals (updated 3 July 2026))
Checked October 2026.