Basic Blue 99
INCI: BASIC BLUE 99
CAS 68123-13-7 EC 268-544-3
3-[(4-amino-6-bromo-5,8-dihydro-1-hydroxy-8-imino-5-oxo-2-naphtyl)amino]-N,N,N-trimethylanilinium chloride (CI 56059)
Limited Data
Insufficient safety data available. Consider enriching this ingredient.
Details
Description
3-[(4-amino-6-bromo-5,8-dihydro-1-hydroxy-8-imino-5-oxo-2-naphtyl)amino]-N,N,N-trimethylanilinium chloride (CI 56059)
Purpose
Function
Hair colorant (naphthoquinoneimine dye), hair conditioning agent
Profile
Properties
Silicone
Silicone free
Compliance
Regulatory Status
EU
Banned
Safety
POOR
US
Permitted
Absorptionlow
Sensitizationlow
MoSadequate
NOAEL180 mg/kg
ConcernHigh
Flags
potential-allergencoloranteu_children_restricted
Verdict
Composition variability is the primary concern with approximately 63% pure dye content and remainder sugars/salts containing potentially 40+ isomeric forms. Weak mutagen in some in vitro assays but CIR concluded no carcinogenic potential at hair dye use levels. Negative 90-day oral, negative DART, negative sensitization/irritation studies.
US Note
Coal tar hair dye exemption applies. CIR 2007: safe as a hair dye ingredient. Re-opened Dec 2022 due to composition variability concerns. Non-hair dye uses (nail polish) are unlawful without FDA color additive approval.
Assessment
Ratings
Reference