Compoatlas

CI 42051

Official label name (INCI name, EU glossary of cosmetic ingredient names), No 6398

CI 42051: Prohibited in hair dyes (Annex II, entry 1356); colorant allowed under conditions (Annex IV, entry 60), under Regulation (EC) No 1223/2009.

In plain words

What it is used for

Functions declared by manufacturers:

Colorant: colours cosmetics and/or imparts colour to the skin and/or its appendages.

What the rules say

Prohibited as a substance in hair dye products. This entry does not cover other uses, which may fall under another annex.

An ingredient can be used as a colorant only if it appears on the list of Annex IV. <function plain_language.<locals>.name at 0x7f77fc79fd80> is on it with a warning to print.

The text of the annexes

Prohibited in hair dyes

CosIng links the name CI 42051 to this entry. The cases of prohibition are explained above, in “In plain words”; the official title is given below.

Entry
Annex II, No 1356
Substance
Ethanaminium, N-(4-((4-diethylamino)phenyl)(5-hydroxy-2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethyl-, hydroxide, inner salt, calcium salt (2:1) (Acid Blue 3; CI 42051) when used as a substance in hair dye products
CAS
3536-49-0
EC
222-573-8
Dates in the act (3)
  • Entry into force on 15 May 2013
  • Application from 11 July 2013
    It shall apply from 11 July 2013.
  • Entry into force on 11 July 2013

Excerpts from the English text published in the Official Journal. A date may concern only some substances of the act: the excerpt says so.

Colorant allowed under conditions

Entry
Annex IV, No 60
Substance
Ethanaminium, N-(4-((4-(diethylamino)phenyl)(5-hydroxy-2,4-disulfophenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-ethylhydroxide, inner salt, calcium salt (2:1) and its insoluble barium, strontium and zirconium lakes, salts and pigments
Glossary names
CI 42051 /ACID BLUE 3
CAS
3536-49-0
EC
222-573-8
Warnings
Purity criteria as set out in Commission Directive 95/45/EC (E 131)
Dates in the act (10)
  • Entry into force on 11 January 2010
  • Application from 1 December 2010
    It shall apply from 11 July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall apply from 11 January 2013.
  • Entry into force on 1 December 2010
  • Condition applicable from 11 January 2012
    As from 11 January 2012, by way of derogation from Directive 76/768/EEC, notification carried out in accordance with Article 13 of this Regulation shall be considered to comply with Article 7(3) and Article 7a(4) of that Directive
  • Application from 11 January 2013
    July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall apply from 11 January 2013.
  • Entry into force on 11 January 2013
  • Application from 11 July 2013
    It shall apply from 11 July 2013, with the exception of: — Article 15(1) and (2) which shall apply from 1 December 2010, as well as Articles 14, 31 and 32 to the extent that they are necessary to apply Article 15(1) and (2); and — Article 16(3) second subparagraph, which shall appl
  • Entry into force on 11 July 2013
  • Placing on the market before 11 July 2013
    Article 39 Transitional provisions By way of derogation from Directive 76/768/EEC, cosmetic products which comply with this Regulation may be placed on the market before 11 July 2013.
  • Placing on the market from 11 July 2013
    As from 11 July 2013, a distributor who makes available in a Member State a cosmetic product already placed on the market in another Member State and translates, on his own initiative, any element of the labelling of that product in order to comply with national law, shall submit, by electronic means, the following info

Excerpts from the English text published in the Official Journal. A date may concern only some substances of the act: the excerpt says so.

Identity

CosIng identifier
32753
CAS (according to CosIng)
3536-49-0
EC (according to CosIng)
222-573-8
Declared functions
Colorant

The CAS number cited by CosIng also covers 1 other INCI name: it designates a family of substances, not this ingredient alone.

Elsewhere in the world

Information on other jurisdictions. What is covered, and what is not yet.

United Kingdom (Great Britain)

  • Prohibited in hair dyes (Annex II)
  • Colorant allowed under conditions (Annex IV)

Same entries as in the European Union. Conditions (concentrations, warnings) may differ: they are not compared here.

Switzerland

Regulation (EC) No 1223/2009 applies in Switzerland (Article 54 of the Ordinance on Foodstuffs and Utility Articles).

United States, federal rules

None of the integrated sections of the federal code (21 CFR 700.11 to 700.27 and 250.250) targets this name. The FDA does not publish a list of allowed ingredients.

Brazil

  • Prohibited: Hidróxido de N-(4-((4-(dietilamino)fenil)(5-hidroxi-2,4-disulfofenil)metileno)-2,5-ciclohexadien-1-ilideno)-N-etil-, etanamínio, seu sal interno e sal de cálcio (2:1 ) (CI 42051) ,quando usado como substância que entra na composição de corantes capilares

    RDC 529/2021, Anexo (prohibited substances), entry 1356, page 47. Conditions (source text, in Portuguese): N° UE: 1356

Recorded cosmetics that contain it

146 recorded products list it, according to Open Beauty Facts contributors. Records are dated: the formula may have changed. See the list (page in French).

Glossary: Commission Implementing Decision (EU) 2025/1175. Page updated on 21 October 2026.