Metol
CAS 55-55-0 · EC 200-237-1 · C14H20N2O6S
Also known as 4-(methylamino)phenol sulfate, Elon, Genol, bis(4-hydroxy-N-methylanilinium) sulphate
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: Warning
Harmful or irritant · Serious health hazard · Hazardous to the environment
- H302 Harmful if swallowed.
- H373 May cause damage to organs through prolonged or repeated exposure.
- H317 May cause an allergic skin reaction.
- H410 Very toxic to aquatic life with long lasting effects.
Photographic uses
- developing agent (D-76, D-19, D-72, D-23, D-96, Ansco 130, PMK)
Used in: Kodak D-76, Kodak D-23, Kodak D-19, Kodak D-72 (Dektol-type), Kodak D-96
Sources
- ECHA CHEM substance record: Bis(4-hydroxy-N-methylanilinium) sulphate (100.000.216)
- 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)
Checked October 2026.