CosIng Checker
CosIng Checker
EU cosmetic ingredients, restrictions and safety
Login
Annex III Entry 276 11/12/2020

BASIC ORANGE 31

2-[(4-Aminophenyl)azo]-1,3- dimethyl-1H-imidazolium chloride

BASIC ORANGE 31 is listed in Annex III and may only be used under the conditions shown in this record. Maximum concentration in this record: (b) 1,0 %.

Search similar Back to annex Compare
Restricted substance— Annex III, EU Regulation 1223/2009
Max conc.: (b) 1,0 %
Entry: 276

Record details

Maximum concentration

(b) 1,0 %

Product type

Hair dye substance in oxidative hair dye products Hair dye substance in non-oxidative hair dye products

Warnings

(a) To be printed on the label: The mixing ratio.
“ Hair colorants can cause severe allergic reactions. Read and follow instructions. This product is not intended for use on persons under the age of 16. Temporary ‘black henna’ tattoos may increase your risk of allergy.
Do not colour your hair if:
— you have a rash on your face or sensitive, irritated and damaged scalp,
— you have ever experienced any reaction after colouring your hair,
— you have experienced a reaction to a temporary ‘black henna’ tattoo in the past.”

INCI glossary name

BASIC ORANGE 31

Chemical name

2-[(4-Aminophenyl)azo]-1,3- dimethyl-1H-imidazolium chloride

Chemical / IUPAC name

2-[(4-Aminophenyl)azo]-1,3- dimethyl-1H-imidazolium chloride

Regulatory information

Regulation

(EC) 2013/1197

SCCS opinions

Identified ingredients

Key data

CAS
97404-02-9
EC
306-764-4
Annex
III
Entry number
276

Inventory links for BASIC ORANGE 31

Inventory Restriction reference
Ref 41527

BASIC ORANGE 31

CAS: 97404-02-9
EC: 306-764-4
Annex III 16
Shared product type

1-NAPHTHOL

CAS: 90-15-3
EC: 201-969-4
Annex III 16
Shared product type

1-Naphthol

CAS: 90-15-3
EC: 201-969-4
Annex III 190
Shared product type

ACID BLUE 9

CAS: 3844-45-9 - 2650-18-2 - 68921-42-6
EC: 223-339-8 - 220-168-0 - 272-939-6
Annex III 191
Shared product type

CURRY RED

CAS: 25956-17-6
EC: 247-368-0
Annex III 192
Shared product type

ACID RED 18

CAS: 2611-82-7 - 12227-64-4
EC: 220-036-2 - 235-438-3
Annex III 193
Shared product type

ACID RED 52

CAS: 3520-42-1
EC: 222-529-8
Annex III 195
Shared product type

ACID BLUE 62

CAS: 4368-56-3
EC: 224-460-9

What Annex III means for BASIC ORANGE 31

BASIC ORANGE 31 is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Ensure formulation concentration does not exceed: (b) 1,0 %
  • Confirm product type compatibility: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products
  • Include required warning statement on product label.
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

BASIC ORANGE 31 is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 97404-02-9 is the unique numerical identifier assigned to BASIC ORANGE 31 by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

The maximum concentration of (b) 1,0 % applies to the concentration of the substance in the ready-to-use cosmetic product. When the substance is supplied as part of a blend or mixture, the calculation must account for the contribution of all sources in the formulation. The combined concentration must not exceed the stated limit.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
Open INCI Checker

Source note for Annex III record BASIC ORANGE 31

This page summarizes one Annex III record for BASIC ORANGE 31 from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for BASIC ORANGE 31, but confirm any final regulatory decision against the current official annex wording and source files.

View sourcesView updates

Tools & next steps

Check your formula

Paste a full INCI list to detect BASIC ORANGE 31 and other flagged EU annex records in one pass.

INCI Checker

Compare entries

Compare BASIC ORANGE 31 side by side with another annex record to review differences in restrictions, concentrations and annex placement.

Compare

Browse the annex

See all records in Annex III and compare regulatory conditions across substances in this annex.

Open Annex III