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Solvent dyes and colorants for plastics

Quinizarin

Also known as 1,4-Dihydroxyanthraquinone, 1,4-dihydroxyanthracene-9,10-dione, Quinizarine

CAS 81-64-1Formula C14H8O4Molar mass 240.21 g/molEC 201-368-7
GHS signal word: Warning. Pictograms: Harmful or irritant 46 suppliers listed
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Quinizarin chemical structure, C14H8O4, CAS 81-64-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Orange crystals from acetic acid, orange plates from ether, deep red needles from alcoho…
Melting point
196 °C
Solubility
MODERATELY SOL IN ALCOHOL WITH RED COLOR
HS code
320419
Category
Solvent dyes and colorants for plastics
Illustrative photo, closed jumbo bulk bags in a warehouse in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Quinizarin?

Plain description, key identifiers and synonyms

Quinizarin is a dihydroxyanthraquinone having the two hydroxy substituents at the 1- and 4-positions, formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxy groups. It has a role as a dye.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,4-dihydroxyanthracene-9,10-dione
CAS number
81-64-1 CAS number cross-checkedOther or deprecated CAS: 103220-12-8
EC number
201-368-7
Molecular formula
C14H8O4
UNII
8S496ZV3CS
MDL number
MFCD00001209
InChIKey
GUEIZVNYDFNHJU-UHFFFAOYSA-N
InChI
InChI=1S/C14H8O4/c15-9-5-6-10(16)12-11(9)13(17)7-3-1-2-4-8(7)14(12)18/h1-6,15-16H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=O)C3=C(C=CC(=C3C2=O)O)O

Synonyms

  • 1,4-Dihydroxyanthraquinone
  • 1,4-dihydroxyanthracene-9,10-dione
  • Quinizarine
  • Chinizarin
  • Solvent Orange 86
  • Smoke Orange R
  • 1,4-Dihydroxyanthrachinon
  • Macrolex Orange GG
  • 1,4-Dihydroxy-9,10-anthraquinone
  • 9,10-Anthracenedione, 1,4-dihydroxy-
  • Anthraquinone, 1,4-dihydroxy-
  • 1,4-Dioxyanthraquinone
  • 1,4-Doa
  • 1,4-Dihydroxy-9,10-anthracenedione
  • C.I. 58050
  • CI 58050
  • 1,4-Dihydroxyanthra-9,10-quinone
  • 1,4-dihydroxy-9,10-dihydroanthracene-9,10-dione
  • 9, 1,4-dihydroxy-
  • C.I.Solvent Orange 86
  • 1,4-Dihydroxy-9,10-anthraquinone, 1,4-Dihydroxyanthraquinone, Smoke Orange R, Quinizarine
  • 4,9-dihydroxy-1,10-anthraquinone
  • 9,10-Dihydroxy-1,4-anthraquinone
  • Quinizarin, 96%
  • ACon1_000101
Show all 30 synonyms
  • Dihydroxyanthraquinone, 1,4-
  • 1,4-dihydroxy-anthracene-9,10-dione
  • 1,4-Dihydroxy-9,10-anthracene-dione
  • 1,4-Dihydroxyanthra-9,10-quinone #
  • 9,10-Anthraquinone, 1,4-dihydroxy-

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

Appearance
Orange crystals from acetic acid, orange plates from ether, deep red needles from alcohol, benzene, toluene, xyleneexp.
Melting point
196 °Cexp.
Solubility
MODERATELY SOL IN ALCOHOL WITH RED COLORexp.

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
240.21 g/molcalc.
Exact mass
240.0423 Dacalc.
LogP (octanol/water)
1.87calc.
Topological polar surface area
74.6 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
18calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0calc.
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, O=C1c2ccccc2C(=O)c2ccccc21

O=C1c2ccccc2C(=O)c2ccccc21

3 rings, 16 atoms, the Anthraquinone ring system.

2,059 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • 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.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Quinizarin suppliers

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

All 46 suppliers
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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

46 suppliers in 8 countries

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Quinizarin 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

Antioxidant in synthetic lubricants.

In the synthesis of experimental antitumor agents.

Fungicide for control of powdery mildew.

Industrial uses: Intermediate.

Roles

  • dye

How it is made

By diazotizing p-chloroaniline, condensing with phthalic anhydride, & hydrolyzing: british patent 373,999, ca 27, 3946 (1933), by treating anthraquinone with ammonium persulfate in sulfuric acid: wacker, j prakt chem [2] 54, 90 (1896). By heating p-chlorophenol, phthalic anhydride & either sulfuric acid or aluminum chloride: reynolds, bigelow, j am chem soc 48, 420 (1926), us patent 1,845,632, ca 26, 2203, org syn coll vol i, 476 (new york, 1941).

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Quinizarin 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 Quinizarin is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Quinizarin, based on the data on this page

What is Quinizarin?

Quinizarin is a dihydroxyanthraquinone having the two hydroxy substituents at the 1- and 4-positions, formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxy groups. It has a role as a dye.

What is the CAS number of Quinizarin?

The CAS registry number of Quinizarin is 81-64-1. Other or deprecated CAS numbers: 103220-12-8.

What is the molecular formula and weight of Quinizarin?

The molecular formula of Quinizarin is C14H8O4 and its molar mass is 240.21 g/mol.

What is Quinizarin used for?

Antioxidant in synthetic lubricants. In the synthesis of experimental antitumor agents. Fungicide for control of powdery mildew. Industrial uses: Intermediate.

Is Quinizarin hazardous?

Quinizarin carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Quinizarin?

Quinizarin 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 Quinizarin?

CompoundList lists 46 suppliers of Quinizarin in China, India, United States, Canada and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Quinizarin in India?

7 suppliers in India list Quinizarin on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Quinizarin?

Suppliers quote Quinizarin 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 Quinizarin

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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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