pyrogallol

American  

[pahy-ruh-gal-awl, -ol, -guh-lawl, -lol] / ˌpaɪ rəˈgæl ɔl, -ɒl, -gəˈlɔl, -ˈlɒl /

noun

1. a white, crystalline, water-soluble, poisonous, solid, phenolic compound, C 6 H 3 (OH) 3 , 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.

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pyrogallol British  

/ ˌpaɪrəʊˈɡælɒl /

noun

1. a white lustrous crystalline soluble phenol with weakly acidic properties; 1,2,3-trihydroxybenzene: used as a photographic developer and for absorbing oxygen. Formula: C 6 H 3 (OH) 3

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Other Word Forms

• pyrogallic adjective

Etymology

Origin of pyrogallol

First recorded in 1875–80; pyro- + gall(ic) ² + -ol ¹

Example Sentences

When ozone is bubbled through a dilute pyrogallol solution, the liquid glows brightly though no heat is evolved.

From Time Magazine Archive

The pyrogallol method of Preisz also proved to be unreliable in his hands.

From Contagious Abortion of Cows by MacNeal, Ward J.

But although pyrogallol is a benzene derivative, and could if necessary be prepared synthetically, it can hardly be claimed as a tar product, as it is generally made from gallic acid.

From Coal and What We Get from It by Meldola, Raphael

If gallic acid be used instead of pyrogallol, the tone is black.

From Photographic Reproduction Processes by Duchochois, Peter C.

In collodion it should at first not be used of greater strength than three to four per cent., as in this form pyrogallol sometimes acts with unexpected energy.

From Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine by Stelwagon, Henry Weightman