Watch-out database → Detailed ingredient information:

3-[(E)-(3-chloro-4-hydroxyphenyl)diazenyl]-2,1-benzisothiazole-5-sulfonamide (HC Blue No. 18)

CAS Nr.

1166834-57-6 / 852356-91-3

Restricted as per EC regulation 1223/2009?

No

Entries

Other observations

Date of update Deadline Content of update Reference Source Obelis articles
01/01/2027 01/01/2027 According to the draft Regulation, HC Blue No. 18 will be restricted (Annex III). Allowed in hair dyes up to 0.35% after mixing (oxidative) and 0.35% in non-oxidative products. Mandatory warnings and instructions must be included on the label. Non-compliant products can no longer be placed on the EU market as of January 1, 2027. The European Commission is restricting the use of new cosmetic ingredients – Omnibus Act 2