CAS number
CAS 2050-34-2 4-(2,4-Dihydroxyphenylazo)benzensulphoni…
CAS 547-57-9 · CAS 2050-34-2 · EC 208-924-8 · EC 218-087-0
Where CAS 2050-34-2 appears: every table entry that prints it among its identifiers, in the newest version of each act this record holds, and every recorded change to those entries. Many entries name a group of substances and print no number, so absence here is not absence from the law. Not legal advice.
Where it appears now
Cosmetics Regulation Annex II, Reference number 1330
Last changed in the version in force , by Regulation (EU) No 344/2013 and Regulation (EU) No 1197/2013, the acts that change names · Annex II on this site
| Reference number | Substance identification | ||
|---|---|---|---|
| Chemical name/INN | CAS number | EC number | |
| a | b | c | d |
| 1330 | 4-(2,4-Dihydroxyphenylazo)benzensulphonic acid and its sodium salt (Acid Orange 6; CI 14270) when used as substance in hair dye products | 2050-34-2 / 547-57-9 (Na) | 218-087-0 / 208-924-8 (Na) |
Look up a number
Type a CAS or EC number, with or without its hyphens, or an Index No into the search box at the top of the page: it reads 50000 as CAS 50-00-0. Every number is also listed by act on the substances page.
Its history
· added · Cosmetics Regulation Annex II, Reference number 1330
Recorded in the version in force , by Regulation (EU) No 344/2013 and Regulation (EU) No 1197/2013, the acts that change names. The change on its version page
| Identifiers | Reference number | Substance identification | ||
|---|---|---|---|---|
| Chemical name/INN | CAS number | EC number | ||
| a | b | c | d | |
| Reference number 1330CAS 2050-34-2CAS 547-57-9EC 208-924-8EC 218-087-0 | 1330 | 4-(2,4-Dihydroxyphenylazo)benzensulphonic acid and its sodium salt (Acid Orange 6; CI 14270) when used as substance in hair dye products | 2050-34-2 / 547-57-9 (Na) | 218-087-0 / 208-924-8 (Na) |
Sources
- Cosmetics Regulation: every version the record holds; rows read from EUR-Lex consolidated version 02009R1223-20260518, in force 18 May 2026 (external, EUR-Lex)