Chemical
Nitric acid
CAS 7697-37-2 · EC 231-714-2 · HNO3
Classification shown is for concentrated acid (above 70%). ECHA lists a separate harmonised entry for 70% and below: Ox. Liq. 3 (H272), Acute Tox. 3 inhalation (H331), Skin Corr. 1A (H314). Both harmonised entries also carry EUH071 (corrosive to the respiratory tract).
- Signal word
- Danger
- CAS
- 7697-37-2
- EC number
- 231-714-2
- UK/EU status
- 1 rule
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 (CLP Annex VI).
Harmonised classes: Ox. Liq. 2 (H272); Acute Tox. 1 (Inhalation) (H330); Skin Corr. 1A (H314).
Signal word: Danger
Oxidising · Acute toxicity · Corrosive
| Code | Hazard statement |
|---|---|
| H272 | May intensify fire; oxidiser. |
| H330 | Fatal if inhaled. |
| H314 | Causes severe skin burns and eye damage. |
| EUH071 | Corrosive to the respiratory tract. |
UK and EU rules
- UK Poisons Act 1972: REGULATED explosives precursor above 3% w/w – an EPP licence is needed for members of the public to acquire/possess above that concentration (GOV.UK list of chemicals, checked 10 October 2026)
Photographic uses
- wet plate collodion silver bath pH
- New Cyanotype clearing bath (dilute)