Poor Cosmetic Ingredient

Basic Blue 41

INCI: BASIC BLUE 41

CAS Number
12270-13-2
Function
Hair dyeing (cationic azo dye, benzothiazolium class)
Safety Rating
POOR

Regulatory Status

🇪🇺 EU Status prohibited
🇺🇸 US Status permitted
US Notes Coal-tar hair dye exemption applies with required caution labeling

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
low
Sensitization
high

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

H302 (harmful if swallowed), H314 (severe skin burns), H373 (organ damage from repeated exposure), H400/H410 (very toxic to aquatic life with long-lasting effects); azo dye reductive cleavage may release aromatic amines — verify against EU Annex II restricted amine list; strongly recommend full toxicological dossier before use

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Concern Level: High

Regulatory Flags

eu_banned_cosmetics eu_cosing_listed

Frequently Asked Questions

Is Basic Blue 41 safe in cosmetics?

H302 (harmful if swallowed), H314 (severe skin burns), H373 (organ damage from repeated exposure), H400/H410 (very toxic to aquatic life with long-lasting effects); azo dye reductive cleavage may release aromatic amines — verify against EU Annex II restricted amine list; strongly recommend full toxicological dossier before use The EU classifies Basic Blue 41 as "prohibited". Safety rating: POOR.

Is Basic Blue 41 allowed in the EU?

Basic Blue 41 EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.

What does Basic Blue 41 do in cosmetics?

Basic Blue 41 functions as: Hair dyeing (cationic azo dye, benzothiazolium class). It is classified as a cosmetic ingredient in our database. CAS number: 12270-13-2.

What is the Margin of Safety for Basic Blue 41?

not established The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

Compliance Tools

Check Basic Blue 41 compliance across multiple jurisdictions:

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Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
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Substance Compliance
Check compliance across 55 jurisdictions
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MoS Calculator
Calculate Margin of Safety using SCCS methodology
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Heavy Metal Limits
Compare limits across jurisdictions

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