单词	pyrogallol
释义	pyrogallol /ˌpʌɪrə(ʊ)ˈɡalɒl / noun [mass noun] Chemistry A weakly acid crystalline compound chiefly used as a developer in photography. Also called pyrogallic acid. Alternative name: 1,3,5-trihydroxybenzene; chemical formula: C6H3(OH)3. Catechol and pyrogallol may be substituted for hydroquinone, but are not as suitable.... 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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