What does the restriction note for ACID RED 51 mean?

The restriction field for ACID RED 51 reads: II/1337 (when used as a substance in hair dye products). This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

InventoryRef 3162912/08/2020

ACID RED 51

Q: How do I check if my formula contains ACID RED 51?

Use the INCI Checker tool on CosIng Checker to paste your full ingredient list and scan it against all EU annex records and allergen flags in one step.

Disodium 2-(2,4,5,7-tetraiodo-6-oxido-3-oxoxanthen-9-yl)benzoate (CI 45430)

ACID RED 51 is linked to 2 EU annex records on this page. Inventory note: II/1337 (when used as a substance in hair dye products).

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Inventory details for ACID RED 51

INCI name

ACID RED 51

INN name

erythrosine

Description

Disodium 2-(2,4,5,7-tetraiodo-6-oxido-3-oxoxanthen-9-yl)benzoate (CI 45430)

Annex records for ACID RED 51

Annex II Restriction reference

Entry 1337

2',4',5',7'-Tetraiodofluorescein, its disodium salt (Acid Red 51; CI 45430) and its aluminium salt …

CAS: 15905-32-5 -- 16423-68-0 -- 12227-78-0

EC: 240-046-0 -- 240-474-8 -- 235-440-4

Annex IV Identified ingredient

Entry 80

CI 45430

CAS: 12227-78-0

EC: 240-474-8

Key data

CAS

16423-68-0; 1342-25-2

240-474-8

Restriction

II/1337 (when used as a substance in hair dye products)

Function

COLORANT HAIR DYEING

How ACID RED 51 appears in the CosIng inventory

The CosIng inventory lists ACID RED 51 as a cosmetic ingredient and this page links it to 2 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

ACID RED 51 is also tagged with 2 cosmetic functions in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

ACID RED 51 appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for ACID RED 51 reads: "II/1337 (when used as a substance in hair dye products)". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, ACID RED 51 carries the following function designation(s):

CAS 16423-68-0; 1342-25-2 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for ACID RED 51

This page combines the CosIng inventory entry for ACID RED 51 with 2 linked Annex II–VI records from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research ACID RED 51 and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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Search similar ingredients

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