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Basic and cationic dyes

C.I. Basic Red 2

Also known as BASIC RED 2, Safranin, Safranine O

CAS 477-73-6Formula C20H19ClN4Molar mass 350.85 g/molEC 207-518-8
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 41 suppliers listed
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C.I. Basic Red 2 chemical structure, C20H19ClN4, CAS 477-73-6
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
477-73-6
Formula
C20H19ClN4
Molar mass
350.85 g/mol
EC number
207-518-8
HS code
320413
Category
Basic and cationic dyes

What is C.I. Basic Red 2?

Plain description, key identifiers and synonyms

Safranin O is an organic chloride salt having 3,7-diamino-2,8-dimethyl-5-phenylphenazin-5-ium as the counterion. It is commonly used for staining Gram negative bacteria. It has a role as a fluorochrome and a histological dye. It contains a 3,7-diamino-2,8-dimethyl-5-phenylphenazin-5-ium.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3,7-dimethyl-10-phenylphenazin-10-ium-2,8-diamine chloride
CAS number
477-73-6 CAS number cross-checked
EC number
207-518-8
Molecular formula
C20H19ClN4
UNII
XTX0YXU2HV
MDL number
MFCD00011759
INCI name
BASIC RED 2
InChIKey
OARRHUQTFTUEOS-UHFFFAOYSA-N
InChI
InChI=1S/C20H18N4.ClH/c1-12-8-17-19(10-15(12)21)24(14-6-4-3-5-7-14)20-11-16(22)13(2)9-18(20)23-17;/h3-11H,1-2H3,(H3,21,22);1H
SMILES (canonical and isomeric)
CC1=CC2=C(C=C1N)[N+](=C3C=C(C(=CC3=N2)C)N)C4=CC=CC=C4.[Cl-]

Synonyms

  • BASIC RED 2
  • Safranin
  • Safranine O
  • Safranine T
  • Safranin T
  • Gossypimine
  • Safranine Zh
  • Safranine A
  • Safranine TH
  • Safranine
  • Safranine B
  • Safranine G
  • Safranine J
  • Safranine Y
  • Safranine GF
  • Safranine OK
  • Safranine TN
  • Safranine TS
  • Safranine YN
  • Tolusafranine
  • Hidaco safranine
  • Mitsui safranine
  • Brilliant safranine G
  • Calcozine Red Y
  • Leather Red HT
Show all 38 synonyms
  • Mitsui safranine T
  • Safranine Superfine G
  • 2,8-Dimethylphenosafranine
  • Brilliant safranine BR
  • Brilliant safranine GR
  • Nippon kagaku safranine T
  • Nippon kagaku safranine GK
  • C.I. 50240
  • Cerven zasadita 2
  • CI 50240
  • Phenazinium, 3,7-diamino-2,8-dimethyl-5-phenyl-, chloride
  • 3,7-Diamino-2,8-dimethyl-5-phenylphenazinium chloride
  • 3,7-Diamino-2,8-dimethyl-5-phenazinium chloride

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
350.85 g/molcalc.
Exact mass
350.1298 Dacalc.
LogP (octanol/water)
0.45calc.
Topological polar surface area
68.81 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
1calc.
Heavy atoms
25calc.
Rings
4calc.
Aromatic rings
4calc.
Fraction sp3 carbons
0.1calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
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, c1ccc(-[n+]2c3ccccc3nc3ccccc32)cc1

c1ccc(-[n+]2c3ccccc3nc3ccccc32)cc1

4 rings, 20 atoms, the Phenazinium, 5-phenyl- ring system.

29 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
Precautionary statements (11)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.

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

Full safety data and first aid

C.I. Basic Red 2 suppliers

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

All 41 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

41 suppliers in 10 countries

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C.I. Basic Red 2 price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

Cosmetic ingredient, INCI name BASIC RED 2(hair dyeing)

Pharmacological actions

  • Coloring Agents
  • Indicators and Reagents

Roles

  • dye
  • fluorescent dye
  • fluorochrome
  • histological dye

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Phenazinium, 3,7-diamino-2,8-dimethyl-5-phenyl- and its salts, when used as a substance in hair dye products, Ref no: 1322, Annex ref: II/1322

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 C.I. Basic Red 2 is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

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

The HS code shown for C.I. Basic Red 2 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about C.I. Basic Red 2, based on the data on this page

What is C.I. Basic Red 2?

Safranin O is an organic chloride salt having 3,7-diamino-2,8-dimethyl-5-phenylphenazin-5-ium as the counterion. It is commonly used for staining Gram negative bacteria. It has a role as a fluorochrome and a histological dye. It contains a 3,7-diamino-2,8-dimethyl-5-phenylphenazin-5-ium.

What is the CAS number of C.I. Basic Red 2?

The CAS registry number of C.I. Basic Red 2 is 477-73-6.

What is the molecular formula and weight of C.I. Basic Red 2?

The molecular formula of C.I. Basic Red 2 is C20H19ClN4 and its molar mass is 350.85 g/mol.

What is C.I. Basic Red 2 used for?

Use classes: Cosmetics.

Is C.I. Basic Red 2 hazardous?

C.I. Basic Red 2 carries the GHS signal word "Danger". Main hazards: causes skin irritation, causes serious eye damage, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of C.I. Basic Red 2?

C.I. Basic Red 2 is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy C.I. Basic Red 2?

CompoundList lists 41 suppliers of C.I. Basic Red 2 in United States, India, China, Germany and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy C.I. Basic Red 2 in India?

8 suppliers in India list C.I. Basic Red 2 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of C.I. Basic Red 2?

Suppliers quote C.I. Basic Red 2 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 C.I. Basic Red 2

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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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