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[mass noun] A weakly acid crystalline compound chiefly used as a developer in photography. Also called pyrogallic acid.
- ‘Catechol and pyrogallol may be substituted for hydroquinone, but are not as suitable.’
- ‘SOD was assayed by the pyrogallol method of Marklund and Marklund.’
- ‘Because of the tanning effect of catechol on emulsion gelatine, it has many of the properties of pyrogallol.’
- ‘One unit of activity was determined as the amount of enzyme that inhibited the oxidation of pyrogallol by 50%.’
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