C17H13N3O3
307.3 g/mol
Dye & PigmentDanger
Toluidine red
CAS2425-85-6EC219-372-2
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
Pigment in paints and inks
Toluidine red is an organic azo pigment with a dark red color, traditionally used in applications such as oil paints. Its structure consists of a 2-naphthol group linked to a 2-nitro-4-methylphenyl substituent.
Pigment in paintsPigment in inks
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
SimilarStructure SimilarSimilarity 0.77
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Safety Reference
Danger
H318Causes serious eye damage
H410Very toxic to aquatic life with long lasting effects
H413May cause long lasting harmful effects to aquatic life
Customs Tariff Classification
The international HS code for Toluidine red (CAS 2425-85-6) is 3204.17.
HS code (international, 6-digit)
3204.17
EU CN code (8-digit)
3204 17 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
1-[(4-methyl-2-nitrophenyl)diazenyl]naphthalen-2-ol
InChIKey
ZLFVRXUOSPRRKQ-UHFFFAOYSA-N
SMILES
CC1=CC(=C(C=C1)N=NC2=C(C=CC3=CC=CC=C32)O)[N+](=O)[O-]
Synonyms (145)
- Accosperse Toluidine Red XL
- Adc Toluidine Red B
- Basoflex Red 361
- C.P. Toluidine Toner A-2990
- C.P. Toluidine Toner RT-6101
- C.P.Toluidine Toner RT-6104
- CP Toluidine toner A-2989
- Calcotone Toluidine Red YP
- Carnelio Helio Red
- Chromatex Red J
- D and C Red No. 35
- Dainichi Permanent Red 4 R
- Deep Fastona Red
- Eljon Fast Scarlet PV Extra
- Eljon Fast Scarlet RN
- Enialit Light Red RL
- Fast Red A
- Fast Red A (VAN)
- Fast Red AB
- Fast Red J
- Fast Red JE
- Fast Red R
- Fastona Red B
- Fastona Scarlet RL
- Fastona Scarlet YS
- Graphtol Red A-4RL
- Hansa Red B
- Hansa Red G
- Hansa Scarlet RB
- Hansa Scarlet RN
- Hansa Scarlet RNC
- Helio Fast Red BN
- Helio Fast Red RL
- Helio Fast Red RN
- Helio Red RL
- Helio Red Toner
- Hispalit Fast Scarlet RN
- Independence Red
- Irgalite Fast Red P4R
- Irgalite Fast Scarlet RND
- Irgalite Red PV2
- Irgalite Red RNPX
- Irgalite Scarlet RB
- Isol Fast Red HB
- Isol Fast Red RN2B
- Isol Fast Red RN2G
- Isol Fast Red RNB
- Isol Fast Red RNG
- Isol Toluidine Red HB
- Isol Toluidine Red RN2B
- Isol Toluidine Red RN2G
- Isol Toluidine Red RNB
- Isol Toluidine Red RNG
- Kromon Helio Fast Red
- Kromon Helio Fast Red YS
- Lake Red 4R
- Lake Red 4RII
- Lithol Fast Scarlet RN
- Lutetia Fast Red 3R
- Lutetia Fast Scarlet RF
- Lutetia Fast Scarlet RJN
- Monolite Fast Scarlet CA
- Monolite Fast Scarlet GSA
- Monolite Fast Scarlet RB
- Monolite Fast Scarlet RBA
- Monolite Fast Scarlet RN
- Monolite Fast Scarlet RNA
- Monolite Fast Scarlet RNV
- Monolite Fast Scarlet RT
- No. 2 Forthfast Scarlet
- Oralith Red P4R
- Organol Scarlet
- Permanent Red 4R
- Recolite Fast Red BL
- Recolite Fast Red RBL
- Recolite Fast Red RL
- Recolite Fast Red RYL
- Sanyo Scarlet Pure
- Sanyo Scarlet Pure No. 1000
- Segnale Light Red 2B
- Segnale Light Red B
- Segnale Light Red BR
- Segnale Light Red C4R
- Segnale Light Red RL
- Siegle Red 1
- Siegle Red B
- Siegle Red BB
- Silogomma Red RLL
- Silosol Red RBN
- Silosol Red RN
- Siloton Red BRLL
- Siloton Red RLL
- Symuler Fast Scarlet 4R
- Syton Fast Scarlet RB
- Syton Fast Scarlet RD
- Syton Fast Scarlet RN
- Toluidine Red 10451
- Toluidine Red 3B
- Toluidine Red 4R
- Toluidine Red B
- Toluidine Red BFB
- Toluidine Red BFGG
- Toluidine Red D 28-3930
- Toluidine Red Light
- Toluidine Red M 20-3785
- Toluidine Red R
- Toluidine Red RT-115
- Toluidine Red Toner
- Toluidine Red XL 20-3050
- Toluidine Red, Dye content
- Toluidine Toner
- Toluidine Toner Dark 5040
- Toluidine Toner HR X-2700
- Toluidine Toner HR X-2741
- Toluidine Toner L 20-3300
- Toluidine Toner RT-252
- Toluidine red
- Toluidine toner 4R X-2700
- Versal Scarlet PRNL
- Versal Scarlet RNL
- Vulcafor Scarlet A
Sourcing Toluidine red?
Post a free purchase request — no account needed. It reaches suppliers of this product, and replies go straight to your inbox.