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32638-88-3

Name PYROGALLOL RED
CAS 32638-88-3
EINECS(EC#) 251-134-3
Molecular Formula C19H12O8S
MDL Number MFCD00005046
Molecular Weight 400.36
MOL File 32638-88-3.mol
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Chemical Properties

Appearance dark brown powder
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.  Store at +5°C to +30°C.
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
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.
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)

Safety Data

Hazard Codes  Xn,Xi
Risk Statements 
Safety Statements 
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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