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Annex II Entry 1261 15/10/2010

Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products

Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.

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Prohibited substance— Annex II, EU Regulation 1223/2009
Entry: 1261

Chemical identity and properties

PubChem 2D chemical structure for CAS 12270-13-2
CAS 12270-13-2PubChem CID 83008

Basic Blue 41

IUPAC name
2-[N-ethyl-4-[(6-methoxy-3-methyl-1,3-benzothiazol-3-ium-2-yl)diazenyl]anilino]ethanol;methyl sulfate
Molecular formula
C20H26N4O6S2
Molecular weight
482.6 g/mol
Exact mass
482.12937691 Da
Topological polar surface area
164.0 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
10
Covalent units
2
Defined stereocentres
0

Also known as

C.I. Basic Blue 41CI Basic Blue 411ECX0J387PANILAN BLUE GRLBB41 dyeBASACRYL BLUE X 3GLBenzothiazolium, 2-(2-(4-(ethyl(2-hydroxyethyl)amino)phenyl)diazenyl)-6-methoxy-3-methyl-, methyl sulfate (1:1)RefChem:116612
16 more reported names
235-546-0Basic BlueC.I.Basic Blue 41Benzothiazolium, 2-((4-(ethyl(2-hydroxyethyl)amino)phenyl)azo)-6-methoxy-3-methyl-, methyl sulfate (salt)UNII-1ECX0J387PBasicBlueC20H26N4O6S2EINECS 235-546-0Basic Blue 41. tech.Basic blue 41 - TechnicalMHOFGBJTSNWTDT-UHFFFAOYSA-MHY-D0492Basic Blue 41, Dye content 40 %CI 11154Ethanol, 2-(ethyl(4-((6-methoxy-3-methyl-2-benzothiazolium)azo)phenyl)amino)-, methyl sulfateCS-0010584
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match83008

Attributed physical-property, hazard, environmental and use annotations.

  • Note: This chemical does not meet GHS hazard criteria for 1.9% (4 of 208) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H302 (65.4%): Harmful if swallowed [Warning Acute toxicity, oral]; H314 (52.4%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H315 (29.8%): Causes skin irritation [Warning Skin corrosion/irritation]; H318 (52.4%): Causes serious eye damage [Danger Serious eye damage/eye irritation]; H319 (42.3%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (28.8%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H373 (52.4%): May causes damage to organs through prolonged or repeated exposure [Warning Specific target organ toxicity, repeated exposure]; H400 (53.4%): Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]; H410 (53.4%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P260, P261, P264, P264+P265, P270, P271, P273, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P351+P338, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P363, P391, P403+P233, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 208 reports by companies from 18 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 4 of 208 reports by companies.; There are 17 notifications provided by 204 of 208 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Chemical name

Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

SCCS opinions

Identified ingredients

Key data

CAS
12270-13-2
EC
235-546-0
Annex
II
Entry number
1261

Inventory links for Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products

Inventory Restriction reference
Ref 32064

BASIC BLUE 41

CAS: 12270-13-2
EC: 235-546-0

Direct matches are limited for this record, so nearby entries from Annex II are shown as well.

What Annex II means for Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products

Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.

Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.

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

  • Verify this substance is absent from all raw materials and finished formulations.
  • Request absence confirmation or CoA from raw material suppliers.
  • Document the screening result in the Product Information File (PIF).

Frequently asked questions

Yes. Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products is listed in Annex II of EU Cosmetics Regulation 1223/2009 and is prohibited as an intentionally added cosmetic ingredient. Article 17 provides a narrow exception for unintended small quantities that are technically unavoidable under good manufacturing practice, provided the product remains safe under Article 3.

CAS 12270-13-2 is the unique numerical identifier assigned to Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products 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.

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.
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Source note for Annex II record Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products

This page summarizes one Annex II record for Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex II conditions for Benzothiazolium, 2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methyl- and its salts, when used as a substance in hair dye products, but confirm any final regulatory decision against the current official annex wording and source files.

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