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InventoryRef 3277814/08/2020

CI 50420

Sulfonated nigrosine color; CI acid black 2

CI 50420 is linked to 2 EU annex records on this page. Inventory note: IV/84 (CI 50420) II/1359 (CI 50420: when used as a substance in hair dye products).

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Prohibited entry found
Open this evidence		2English and EU languages
Great BritainEvidence linked
Prohibited
Open this evidence		1English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandEvidence linked
Prohibited + Permitted list with conditions
Open this evidence		2English
ASEANEvidence linked
Prohibited
Open this evidence		1English and national languages
ChinaSource mapped
Official source mapped; ingredient rule not imported
0Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaSource mapped
Official source mapped; ingredient rule not imported
0Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilEvidence linked
Prohibited
Open this evidence		1Portuguese with INCI crosswalks
IndiaEvidence linked
Prohibited
Open this evidence		1English and Hindi
Saudi ArabiaEvidence linked
Prohibited
Open this evidence		1Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 8005-03-6
CAS 8005-03-6PubChem CID 135442942

2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-(2-(4-nitrophenyl)diazenyl)-6-(2-phenyldiazenyl)-, sodium salt (1:?)

Amido Black 10B is an organic sodium salt resulting from the formal condensation of Amido Black 10B (acid form) with two equivalents of sodium hydroxide. It has a role as a histological dye. It contains a 4-amino-5-hydroxy-3-[(p-nitrophenyl)azo]-6-(phenylazo)-naphthalene-2,7-disulfonate. — ChEBI

IUPAC name
disodium;4-amino-5-hydroxy-3-[(4-nitrophenyl)diazenyl]-6-phenyldiazenylnaphthalene-2,7-disulfonate
Molecular formula
C22H14N6Na2O9S2
Molecular weight
616.5 g/mol
Exact mass
616.00590696 Da
Topological polar surface area
273.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
14
Covalent units
3
Defined stereocentres
0

Also known as

4-Amino-5-hydroxy-3-((4-nitrophenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium saltRefChem:446195280-105-8ACID BLACK 11064-48-8Naphthol Blue BlackAmido Black 10BAcid black 2
16 more reported names
Buffalo Black NBRC.I. Acid Black 1NIGROSINEAmidoschwarzAmido blackC.I. Acid Black 1, disodium saltAcidal Black 10BNaphthol Blue Black BAcidal Navy Blue 3BRAcid Blue BlackAcid Blue-BlackC.I. 20470Sandopel Blue PBoruta Black ASolar Blue BlackAcid Black H
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for CI 50420

INCI name

CI 50420

Description

Sulfonated nigrosine color; CI acid black 2

Record provenance

Inventory reference
32778
Imported identity
CI 50420
Source update
14/08/2020
European Commission CosIng source notes
Annex IV Restriction reference
Entry 84

CI 50420

CAS: 8005-03-6

Key data

CAS
8005-03-6
EC
—
Restriction
IV/84 (CI 50420) II/1359 (CI 50420: when used as a substance in hair dye products)
Function
COLORANT
Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light. All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#6423 · CI 50420

Ingredients with overlapping formulation functions

CI 45430COLORANT
CI 47000COLORANT
CI 47005COLORANT
CI 50325COLORANT
CI 51319COLORANT
CI 58000COLORANT
CI 59040COLORANT
CI 60724COLORANT

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How CI 50420 appears in the CosIng inventory

The CosIng inventory lists CI 50420 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.

CI 50420 is also tagged with 1 cosmetic function 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

CI 50420 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 CI 50420 reads: "IV/84 (CI 50420) II/1359 (CI 50420: 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, CI 50420 carries the following function designation(s):

CAS 8005-03-6 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 CI 50420

This page combines the CosIng inventory entry for CI 50420 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 CI 50420 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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