Disodium EDTA
CAS 139-33-3 · EC 205-358-3
Also known as disodium dihydrogen ethylenediaminetetraacetate
Most-notified classification only 25.19% of notifications.
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
There is no official EU classification. Shown is the classification most companies have notified to ECHA: 25.19% of notifications, 17 distinct classifications notified.
Signal word: Warning
Harmful or irritant · Serious health hazard
- H332 Harmful if inhaled.
- H373 May cause damage to organs through prolonged or repeated exposure.
Photographic uses
- sequestering agent
- cyanotype/platinum clearing
Sources
- ECHA CHEM substance record: Disodium dihydrogen ethylenediaminetetraacetate (100.004.872)
- 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.