pyrogallol

/pahy-ruh-gal-awl, -ol, -guh-lawl, -lol/US // ˌpaɪ rəˈgæl ɔl, -ɒl, -gəˈlɔl, -ˈlɒl //UK // (ˌpaɪrəʊˈɡælɒl) //

焦糖醇,焦耳醇,焦糖醛,丙酮醛

Definitions

n.名词 noun

1
- : a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C6H33, obtained by heating gallic acid and water: used chiefly as a developer in photography, as a mordant for wool, in dyeing, and in medicine in the treatment of certain skin conditions.

Sumach is the other pyrogallol tan of commercial importance.
Pyrogallol is valuable, and is employed in the same manner and strength as chrysarobin.
Newton employs it in combination with pyrogallol and soda in the development of bromo-gelatine plates.
The phthaleïn formed from gallic acid and phthalic anhydride really results from the union of the latter with pyrogallol.
The tannins are divided into two general classes, known respectively as the pyrogallol tannins and the catechol tannins.