Basic Blue 99
AKA “C.I. Basic Blue 99, Jarocol Steel Blue, CI 56059, ARIANOR STEEL BLUE 306004, Benzenaminium, 8-dihydro-1-hydroxy-8-imino-5-oxo-2-naphthalenyl)amino)-N, chloride
Synthetic
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Ingredient Facts
Basic blue 99
AKA: C.I. Basic Blue 99, Jarocol Steel Blue, CI 56059, ARIANOR STEEL BLUE 306004, Benzenaminium, 8-dihydro-1-hydroxy-8-imino-5-oxo-2-naphthalenyl)amino)-N, Chloride
Synthetic · Hair Conditioning | Hair Dyeing · EWG: 4
Plant-Derived
Skin Conditioner
Hair Care
Synthetic
Clean
A synthetic colorant that adds rich, lasting color to hair while providing conditioning benefits to keep strands soft and manageable.
Formula
C19H20BrClN4O2
Mol. Weight
451.70
CAS #
68123-13-7
Plant-Derived
Synthetic. Basic Blue 99 is a synthetic triphenylmethane dye belonging to the family of cationic colorants. It is synthesized through oxidative coupling reactions of aromatic amines and related precursor compounds.
Function
Hair Conditioning | Hair Dyeing
Benefits
Conditions Hair
Hair Dyeing
Antioxidant Protection
Locks In Moisture
Brightens Skin
Softens and detangles hair
Colors hair
Traditional Use
Synthetic organic colorant developed in the late 20th century, used in cosmetics as a blue dye for eyeshadows, nail polishes, and other color cosmetic products requiring vibrant blue hues.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Caution
EWG Score4
CIR Safety Findings
ewg-4, medical-approval, all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR