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Basic and cationic dyes

Magenta base

Also known as Solvent Red 41, Fuchsine Base, Rosaniline base

CAS 3248-93-9Formula C20H19N3Molar mass 301.39 g/molEC 221-832-2
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Magenta base chemical structure, C20H19N3, CAS 3248-93-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
3248-93-9
Formula
C20H19N3
Molar mass
301.39 g/mol
Solubility
ALMOST INSOL IN ETHER /MAGENTA/
HS code
320419
Category
Basic and cationic dyes

What is Magenta base?

Plain description, key identifiers and synonyms

Rosanilin free base is an imine that is 4-methylidenecyclohexa-2,5-dien-1-imine in which the hydrogens of the methylidene group are replaced by 4-aminophenyl and 3-methyl-4-aminophenyl groups. The monohydrochloride salt is the histological dye 'rosanilin'. It has a role as a carcinogenic agent, a fluorochrome and a histological dye. It is an imine and a substituted aniline. It is a conjugate base of a rosanilin(1+).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[(4-aminophenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]aniline
CAS number
3248-93-9 CAS number cross-checked
EC number
221-832-2
Molecular formula
C20H19N3
UNII
I8F3948441
MDL number
MFCD00055278
InChIKey
YDCMWLQSPFTWCS-UHFFFAOYSA-N
InChI
InChI=1S/C20H19N3/c1-13-12-16(6-11-19(13)23)20(14-2-7-17(21)8-3-14)15-4-9-18(22)10-5-15/h2-12,23H,21-22H2,1H3
SMILES (canonical and isomeric)
CC1=CC(=C(C2=CC=C(C=C2)N)C3=CC=C(C=C3)N)C=CC1=N

Synonyms

  • Solvent Red 41
  • Fuchsine Base
  • Rosaniline base
  • Waxoline Red A
  • Fuchsive base
  • para-Rosaniline
  • C.I. Solvent Red 41
  • CI Solvent Red 41
  • Fuchsin (basic)
  • Fuchsine HF Base
  • C.I. Basic Violet 14, free base
  • CI 42510B
  • CI Basic Violet 41, free base
  • Benzenamine, 4-((4-aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl)-2-methyl-
  • o-Toluidine, 4-((p-aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl)-
  • 2,4-Xylidine, alpha(sup 4)-(p-aminophenyl)-alpha(sup 4)-(4-imino-2,5-cyclohexadien-1-ylidene)-
  • Benzenamine, 4-[(4-aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl]-2-methyl-
  • oToluidine, 4((paminophenyl)(4imino2,5cyclohexadien1ylidene)methyl)
  • 4((4Aminophenyl)(4imino2,5cyclohexadien1ylidene)methyl)2methylbenzenamine
  • Benzenamine, 4((4aminophenyl)(4imino2,5cyclohexadien1ylidene)methyl)2methyl
  • 2,4Xylidine, alpha(sup 4)(paminophenyl)alpha(sup 4)(4imino2,5cyclohexadien1ylidene)
  • 4-[(4-aminophenyl)(4-iminocyclohexa-2,5-dien-1-ylidene)methyl]-2-methylaniline
  • rosanilin free base
  • 4-((4-Aminophenyl)(4-iminocyclohexa-2,5-dien-1-ylidene)methyl)-2-methylaniline
  • 4-[(4-aminophenyl)-(4-imino-3-methylcyclohexa-2,5-dien-1-ylidene)methyl]aniline
Show all 34 synonyms
  • 4-((4-Aminophenyl)(4-imino-2,5-cyclohexadien-1-ylidene)methyl)-2-methylbenzenamine
  • C.I. 42510 acetate
  • 4-[(4-aminophenyl)-(4-iminocyclohexa-2,5-dien-1-ylidene)methyl]-2-methyl-aniline
  • C.I. Solvent Red 41, monoacetate
  • basic-fuchsin
  • 4-((4-Aminophenyl)(4-iminocyclohexa-2,5-dien-1-ylidene)methyl)-o-toluidine
  • C.I. Basic Violet 14- free base (parent)
  • 4-((4-aminophenyl)(4-iminocyclohexa-2,5-dien-1- ylidene)methyl)-o-toluidine
  • 4-[(4-amino-phenyl)-(4-imino-cyclohexa-2,5-dienylidene)-methyl]-2-methyl-phenylamine

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Solubility
ALMOST INSOL IN ETHER /MAGENTA/exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
301.39 g/molcalc.
Exact mass
301.1579 Dacalc.
LogP (octanol/water)
4.19calc.
Topological polar surface area
75.89 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
23calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.05calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, N=C1C=CC(=C(c2ccccc2)c2ccccc2)C=C1

N=C1C=CC(=C(c2ccccc2)c2ccccc2)C=C1

3 rings, 20 atoms.

94 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Magenta base suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 5 suppliers
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Where suppliers are based

5 suppliers in 5 countries

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Magenta base price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

As dye or dye intermediate, coloring textile fibers, fabrics, paper products, to dye cotton, wool, jute fibers, china clay products, leather, in printing inks, as a filter dye in photography, biological stain, lab reagent, in thin-layer chromatography (magenta).

Dye for oils, fats, waxes (especially for polishes), dye for carbon papers and ball point pen inks.

Roles

  • aetiopathogenetic role
  • carcinogenic agent
  • dye
  • fluorescent dye
  • fluorochrome
  • histological dye

How it is made

Oxidation of a mixture of aniline, o(and p)-toluidine & their hydrochlorides with nitrobenzene, or a mixture of nitrobenzene & o-nitrotoluene, in presence of ferrous chloride, ferrous oxide & zinc chloride, followed by neutralization to the free base

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: 4-[(4-Aminophenyl)(4-iminocyclohexa-2,5-dien-1-ylidene)methyl]-o-toluidine (CAS 3248-93-9, EINECS 221-832-2) and its hydrochloride salt (Basic Violet 14, …

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Magenta base is traded under.

HS 3204.19Indicative HS code

Synthetic organic colouring matter and preparations based thereon as specified in note 3…

World exports in 2024
$1.08B
+0.2% vs 2023, imports $1.14B
2019 to 2024
Top exporters
  1. United States23.7%
  2. India * partner reported12.4%
  3. China9.0%
Top importers
  1. Germany7.5%
  2. France * partner reported6.4%
  3. Mexico5.4%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Magenta base is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Magenta base, based on the data on this page

What is Magenta base?

Rosanilin free base is an imine that is 4-methylidenecyclohexa-2,5-dien-1-imine in which the hydrogens of the methylidene group are replaced by 4-aminophenyl and 3-methyl-4-aminophenyl groups. The monohydrochloride salt is the histological dye 'rosanilin'.

What is the CAS number of Magenta base?

The CAS registry number of Magenta base is 3248-93-9.

What is the molecular formula and weight of Magenta base?

The molecular formula of Magenta base is C20H19N3 and its molar mass is 301.39 g/mol.

What is Magenta base used for?

As dye or dye intermediate, coloring textile fibers, fabrics, paper products, to dye cotton, wool, jute fibers, china clay products, leather, in printing inks, as a filter dye in photography, biological stain, lab reagent, in thin-layer chromatography (magenta).

Is Magenta base hazardous?

No GHS hazard classification for Magenta base is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Magenta base?

Magenta base is usually classified under HS code 320419 (Synthetic organic colouring matter and preparations based thereon as specified in note 3…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Magenta base?

CompoundList lists 5 suppliers of Magenta base in Canada, China, Hong Kong, Ukraine and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Magenta base?

Suppliers quote Magenta base on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Magenta base

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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