PYROGALLOL RED

Chemical Properties

Product Name: PYROGALLOL RED
CAS No.: 32638-88-3
Chemical Name: PYROGALLOL RED
Synonyms: PR;PYROGALLOLUM;PYROGALLOL RED;PyrogallolRedGr;PYROGALLIC ACID;PYROGALLOL RED AR;PYROGALLIC ACID RED;1,2,3-BENZENETRIOL RED;PYROGALLOL RED-LACTONE;Pyrogallol Red,98%,pure
CBNumber: CB1314191
Molecular Formula: C19H12O8S
Formula Weight: 400.36
MOL File: 32638-88-3.mol

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PYROGALLOL RED Property

Melting point:: 133-134 °C(lit.)
Boiling point:: 309 °C(lit.)
Density: 1.082 g/mL at 20 °C
vapor density: 4.4 (vs air)
vapor pressure: 10 mm Hg ( 167.7 °C)
refractive index: n20/D 1.387
storage temp.: Inert atmosphere,Room Temperature
solubility: 1 M NH4OH: 10mg/mL, clear
form: Liquid
pka: 7.86±0.20(Predicted)
color: Dark brown
Water Solubility: Soluble in water, ammonium hydroxide (10 mg/ml), and ethanol.
BRN: 363738
InChI: InChI=1S/C19H12O8S/c20-12-7-5-10-17(15(12)22)26-18-11(6-8-13(21)16(18)23)19(10)9-3-1-2-4-14(9)28(24,25)27-19/h1-8,20-23H
InChIKey: KUQNCHZOCSYKOR-UHFFFAOYSA-N
SMILES: S1(=O)(=O)C2=CC=CC=C2C2(C3=C(C(O)=C(O)C=C3)OC3=C2C=CC(O)=C3O)O1
CAS DataBase Reference: 32638-88-3
EPA Substance Registry System: Spiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]-3',4',5',6'-tetrol, 1,1-dioxide (32638-88-3)

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Safety

Hazard Codes: Xn,Xi
Risk Statements: 20/21/22-52/53-68-36/37/38
Safety Statements: 36/37-61-24/25-22-36-26
RIDADR: UN 2811 6.1/PG 3
WGK Germany: 3
RTECS: UX2800000
F: 8
TSCA: Yes
HS Code: 2934 99 90

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Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H302Harmful if swallowed

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

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N-Bromosuccinimide Price

Sigma-Aldrich

Product number: P8759
Product name: Pyrogallol Red
Packaging: 5g
Price: $205
Updated: 2025/07/31

Sigma-Aldrich

Product number: 1.07534
Product name: Pyrogallol red
Purity: metal indicator
Packaging: 1g
Price: $239
Updated: 2025/07/31

TCI Chemical

Product number: P0572
Product name: Pyrogallol Red
Packaging: 1g
Price: $53
Updated: 2025/07/31

TCI Chemical

Product number: P0572
Product name: Pyrogallol Red
Packaging: 5g
Price: $151
Updated: 2025/07/31

TCI Chemical

Product number: P1976
Product name: Pyrogallol Red [for Protein Research]
Packaging: 1g
Price: $106
Updated: 2025/07/31

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PYROGALLOL RED Chemical Properties,Usage,Production

Chemical Properties

Also know nas pyrogallol and 1,2,3-trihydroxy-benzene,C6H3(OH)3 is white,lustrous crystals that turn gray on exposure to light. It is soluble in water,alcohol,and ether. A solution of pyrogallol acquires a brown color on exposure to air. This absorption of oxygen and change of color take place rapidly when the solution is made alkaline. Derivation is by heating gallic acid in an autoclave with three times its weight of water.
Uses are as a protective colloid in preparation of metallic colloidal solutions, photography, dyes, intermediates, synthetic drugs, medicine (antibacterial), process engraving, laboratory reagent, gas analysis (an oxygen absorber), reducing agent, and antioxidant in lubricating oils.

Chemical Properties

dark brown powder

Uses

The white powdery crystal was made by the superheating of gallic acid. Pyrogallic acid, popularly known as pyro, is one of the earliest developers and its use has spanned three centuries. It was first used in an acid state to physically develop wet collodion negatives. When silver bromide gelatin plates were adopted pyro was used again but in an alkaline state for chemical development. It was used throughout the 20th century and often chosen for the peculiar yellow stain it imparted to gelatin negatives.

Uses

Pyrogallol Red is a complexometric indicator for the metal elements molybdenum and copper. Dyes and metabolites.

Purification Methods

It is recrystallised from aqueous alkaline solution (Na2CO3 or NaOH) by precipitation on acidification, filter it off and dry in a vacuum. [Suk Collect Czech Chem Commun 31 3127 1966, Beilstein 19 H 407, 19 II 417, 19 III/IV 599, 19/10 V 226.]

PYROGALLOL RED Preparation Products And Raw materials

Raw materials

Preparation Products

Praseodymium oxide Fosthiazate Bromopyrogallol Red Praseodymium-Zircon Yellow Lanthanum oxide Praseodymium(III) nitrate hexahydrate

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PYROGALLOL RED Suppliers

Americas 1 Austria 1 Belgium 1 Canada 1 China 131 Czech Republic 1 Europe 3 France 1 Germany 4 India 9 Japan 7 Slovakia 1 South Korea 1 Switzerland 2 The Netherlands 1 United Kingdom 9 United States 41 Global 215

Wuhan Hejingxing Biotechnology Co., Ltd

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Yantai Shengkailun Chemical Technology Co., Ltd.

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Wuhan Roche Technology Development Co., Ltd.,

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Alfa Aesar

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TCI (Shanghai) Development Co., Ltd.

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View Lastest Price from PYROGALLOL RED manufacturers

Hebei Chuanghai Biotechnology Co., Ltd

Product: PYROGALLOL RED 32638-88-3
Price: US $0.00/KG
Min. Order: 1KG
Purity: 99%
Supply Ability: 500000kg
Release date: 2024-10-30

Hubei Lidu New Material Technology Co., Ltd

Product: PYROGALLOL RED 32638-88-3
Price: US $0.00-0.00/g
Min. Order: 1g
Purity: 95%
Supply Ability: 20tons
Release date: 2024-09-24

Hebei Yanxi Chemical Co., Ltd.

Product: PYROGALLOL RED 32638-88-3
Price: US $40.00/kg
Min. Order: 1kg
Purity: 0.99
Supply Ability: 10 tons
Release date: 2023-10-09

32638-88-3, PYROGALLOL REDRelated Search:

3-Carboxy-2,2,5,5-tetraMethylpyrrolidine 1-Oxyl Free Radical Silver 3-CARBAMOYL-PROXYL Acid Blue 129 PYROGALLOL RED,PYROGALLOL RED-LACTONE GOLD ACID ORANGE 63 Phenol Red Pyrogallol Praseodymium, plasma standard solution, Specpure|r, Pr 10,000^mg/ml Petroleum resin PR1 Petroleum resin PR2 PR23-2.5 Pulley reducer TOTAL PROTEIN KIT MICRO PYROGALLOL RED Praseodymium, plasma standard solution, Specpure|r, Pr 1000^mg/ml TOTAL PROTEIN REAGENT, MICRO PYROGALLOL RED METHOD TOTAL PROTEIN KIT, MICRO PYROGALLOL RED METHOD Praseodymium, AAS standard solution, Specpure|r, Pr 1000^mg/ml

PYROGALLOL RED INDICATOR FOR &

PyrogallolRedGr

Pyrogallol Red, indicator grade, pure

Pyrogallol Red, pure, 98%

Spiro(3H-2,1-benzoxathiole-3,9’(9H)xanthene)-3’,4’,5’,6’-tetrol,1,1-dioxide

spiro[3h-2,1-benzoxathiole-3,9’-[9h]xanthene]-3’,4’,5’,6’-tetrol,1,1-dioxide

PR

PYROGALLOL RED, INDICATOR FOR COMPLEXO-M ETRY

Pyrogallol red, pure, indicator grade

3',4',5',6'-Tetrahydroxyspiro[3H-2,1-benzoxathiole-3,9'-[9H]xanthene]1,1-dioxide

Pyrogallol Red,98%,pure

PYROGALLOL RED METAL INDICATOR

Pyrogallol Red [for Protein Research]

3',4',5',6'-tetrahydroxyspiro[benzo[c][1,2]oxathiole-3,9'-xanthene] 1,1-dioxide

1,2,3-BENZENETRIOL RED

1,2,3-TRIHYDROXYBENZENE RED

ALKALINE POTASSIUM PYROGALLATE SOLUTION

ALKALINE PYROGALLOL REAGENT

PYROGALLOL RED

PYROGALLOL RED-LACTONE

PYROGALLOLSULFONEPHTHALEIN

PYROGALLOLSULFONPHTHALEIN

PYROGALLOLUM

PYROGALLOSULFONPHTHALEIN

PYROGALLATE ABSORPTION SOLUTION, ALKALINE

PYROGALLIC ACID

PYROGALLIC ACID RED

Pyrogallolred,monohydrate

Pyrogallolsulfonphalein

2-(3,4,5,6,9-PENTAHYDROXYXANTHEN-9-YL)BENZENESULFONIC ACID-9-LACTONE

Pyrogallolsulfonphthalein (PR)

PYROGALLOL RED AR

32638-88-3

C19H12O8S

87661

Chelating Reagents

Bipyridyls, etc. (Chelating Reagents)

Analytical Chromatography Product Catalog

Metal Titration Indicators

Indicators

Titration

Analytical Chemistry

Bipyridyls, etc. (Chelating Reagents)

Chelating Reagents