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Impurities and reference standards

Pyrogallol

Also known as benzene-1,2,3-triol, 1,2,3-trihydroxybenzene, pyrogallic acid

CAS 87-66-1Formula C6H6O3Molar mass 126.11 g/molEC 201-762-9
GHS signal word: Warning. Pictograms: Harmful or irritant, Serious health hazard 144 suppliers listed
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Pyrogallol chemical structure, C6H6O3, CAS 87-66-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White, lustrous crystals or plates
Melting point
133 °C
Boiling point
309 °C
Density
1.453 g/cm³ at 4 °C
Solubility
1 g dissolves in 1.7 mL water, 1.3 mL alcohol, 1.6 mL ether, slightly sol in benzene, ch…
HS code
290729
Category
Impurities and reference standards
UN number
UN 2811
Illustrative photo, colourless crystals in an open woven sack in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Pyrogallol?

Plain description, key identifiers and synonyms

Pyrogallol is a benzenetriol carrying hydroxy groups at positions 1, 2 and 3. It has a role as a plant metabolite. It is a phenolic donor and a benzenetriol.

Pyrogallol is a benzene-1,2,3-triol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
benzene-1,2,3-triol
CAS number
87-66-1 CAS number cross-checkedOther or deprecated CAS: 30813-84-4
EC number
201-762-9
Molecular formula
C6H6O3
UNII
01Y4A2QXY0
MDL number
MFCD00002192
INCI name
PYROGALLOL
InChIKey
WQGWDDDVZFFDIG-UHFFFAOYSA-N
InChI
InChI=1S/C6H6O3/c7-4-2-1-3-5(8)6(4)9/h1-3,7-9H
SMILES (canonical and isomeric)
C1=CC(=C(C(=C1)O)O)O

Synonyms

  • benzene-1,2,3-triol
  • 1,2,3-trihydroxybenzene
  • pyrogallic acid
  • 1,2,3-benzenetriol
  • fourrine PG
  • Fouramine Brown AP
  • fourrine 85
  • Pyro
  • C.I. Oxidation Base 32
  • fouramine base ap
  • 1,2,3-Trihydroxybenzen
  • C.I. 76515
  • CI Oxidation Base 32
  • Benzene, 1,2,3-trihydroxy-
  • CI 76515
  • acid, Pyrogallic
  • Piral
  • 2,3-Dihydroxyphenol
  • Pyrogallol, acs
  • 1,2,3-Trihydroxy-benzene
  • Pyrogallic
  • 1,2,3-Trihydroxybenzen (CZECH)
  • Pyrogallol acid
  • PYG
  • Phloroglucinol EP Impurity A
Show all 35 synonyms
  • trihydroxybenzene
  • 1,3-Benzenetriol
  • PYROP
  • Pyrogallol ACS grade
  • 1,3-Trihydroxybenzen
  • Pyrogallol (Standard)
  • 1,3-Trihydroxybenzene
  • benzene-1,2-3-triol
  • Pyrogallol, ACS reagent
  • Phloroglucinol Impurity A

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
White, lustrous crystals or platesexp.
Odour
Odorlessexp.
Melting point
133 °Cexp.
Boiling point
309 °Cexp.
Density
1.453 g/cm³ at 4 °Cexp.
Solubility
1 g dissolves in 1.7 mL water, 1.3 mL alcohol, 1.6 mL ether, slightly sol in benzene, chloroform, carbon disulfideexp.
Vapour pressure
4.79 × 10⁻⁴ mm Hg at 25 °C /extrapolated/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
126.11 g/molcalc.
Exact mass
126.0317 Dacalc.
LogP (octanol/water)
0.8calc.
Topological polar surface area
60.69 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
Rings
1calc.
Aromatic rings
1calc.
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, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 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
GHS08: Serious health hazard
Serious health hazard
030NFPA 704 rating

Hazard statements

  • H302Harmful if swallowed.
  • H312Harmful in contact with skin.
  • H332Harmful if inhaled.
  • H341Suspected of causing genetic defects.
  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (17)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2811

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

Pyrogallol suppliers

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

All 144 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

144 suppliers in 22 countries

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Pyrogallol 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

Developer in photography, making colloidal soln of metals, as mordant for wool, staining leather, process engraving, manufacture of various dyes, dyeing furs, hair, analytical chemistry reagent for antimony and bismuth, active reducer for gold, silver and mercury salts, for absorption of oxygen in gas analysis.

Dyestuffs intermediate, mordant (wool/leather dyeing), analytical reagent (antimony, bismuth, gas analysis).

Preparation of ... intermediates, synthetic drugs, medicine (antibacterial), process engraving, laboratory reagent ... antioxidant in lubricating oils.

Manufacture of polymers.

Cosmetic ingredient, INCI name PYROGALLOL(hair dyeing)

Pharmacological actions

  • Antioxidants

Roles

  • eukaryotic metabolite
  • metabolite
  • plant metabolite

Functional uses

  • Dye

Cosmetic functions

  • Hair dyeing

How it is made

From gallic acid (decarboxylation), from cyclohexanone (alpha chlorination/hydration/dehydrochlorination)

Heating gallic acid with three times its weight of water in an autoclave

Commercially produced by decarboxylation of gallic acid, which is prepared by hydrolysis of tannin.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 604-009-00-6

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Pyrogallol, Ref no: 409, Annex ref: II/409

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 Pyrogallol is traded under.

HS 2907.29Indicative HS code

Polyphenols, phenol-alcohols, other

World exports in 2024
$535M
−27.0% vs 2023, imports $565M
2019 to 2024
Top exporters
  1. India * partner reported17.7%
  2. Germany16.5%
  3. Japan15.8%
Top importers
  1. United States13.1%
  2. Japan8.0%
  3. Belgium7.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Pyrogallol?

Pyrogallol is a benzenetriol carrying hydroxy groups at positions 1, 2 and 3. It has a role as a plant metabolite. It is a phenolic donor and a benzenetriol.

What is the CAS number of Pyrogallol?

The CAS registry number of Pyrogallol is 87-66-1. Other or deprecated CAS numbers: 30813-84-4.

What is the molecular formula and weight of Pyrogallol?

The molecular formula of Pyrogallol is C6H6O3 and its molar mass is 126.11 g/mol.

What is Pyrogallol used for?

Developer in photography, making colloidal soln of metals, as mordant for wool, staining leather, process engraving, manufacture of various dyes, dyeing furs, hair, analytical chemistry reagent for antimony and bismuth, active reducer for gold, silver and mercury salts, for absorption of oxygen in gas analysis.

Is Pyrogallol hazardous?

Pyrogallol carries the GHS signal word "Warning". Main hazards: harmful if swallowed, harmful in contact with skin, harmful if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Pyrogallol?

Pyrogallol is usually classified under HS code 290729 (Polyphenols, phenol-alcohols, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyrogallol?

CompoundList lists 144 suppliers of Pyrogallol in China, United States, United Kingdom, Germany and 18 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Pyrogallol in India?

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

What is the price of Pyrogallol?

Suppliers quote Pyrogallol 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 Pyrogallol

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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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