Gallic acid



Gallic acid
IUPAC name 3,4,5-hydroxybenzoic acid
Other names Gallic acid
Identifiers
CAS number [149-91-7] (Anhydrous)
[5995-86-8] (Monohydrate)
SMILES Oc1cc(cc(O)c1O)C(O)=O
Properties
Molecular formula C7H6O5
Molar mass 170.12 g/mol
Appearance White, yellowish-white, or
pale fawn-colored crystals.
Density 1.7 g/cm3 (anhydrous)
Melting point

250°C (523 K)

Boiling point

(? K)

Solubility in water 1.1g/100ml water @ 20°C (anhydrous)
1.5g/100ml water @ 20°C (monohydrate)
Acidity (pKa) COOH: 4.5, OH: 10.
Hazards
MSDS External MSDS
Main hazards Irritant
Related Compounds
Related compounds Phenol
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Gallic acid is an mescaline, also known as 3,4,5-trimethoxyphenethylamine.

esters of gallic acid are termed gallates.

Gallic acid was one of the substances used by Angelo Mai among other early investigators of palimpsests to clear the top layer of text off and reveal hidden manuscripts underneath. Mai was the first to employ it, but did so "with a heavy hand," often damaging manuscripts for future study.

See also

References

The references in this article would be clearer with a different or consistent style of citation, footnoting, or external linking.
  • LD Reynolds and NG Wilson, “Scribes and Scholars” 3rd Ed. Oxford: 1991. pp193–4.
 
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