pyrogalloln.
/ˌpʌɪrə(ʊ)ˈɡalɒl/, U.S. /ˌpaɪroʊˈɡæˌlɔl/, /ˌpaɪroʊˈɡæˌlɑl/ Chemistry.
A weakly acidic crystalline substance used esp. in photographic developers as a reducing agent and in gas analysis as an absorbing agent for oxygen. Also called pyrogallic acid.Pyrogallol is a trihydric phenol, 1,2,3-trihydroxybenxene; C6H3(OH)3.
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society > leisure > the arts > visual arts > photography > chemicals > [noun] > reducing agent
pyrogallic acid1835
pyrogallin1857
reducer1858
pyrogallol1868
pyro1879
1868 G. Fownes Man. Elem. Chem. (ed. 10) iii. 667 Pyrogallol, or pyrogallic acid, produced by the action of heat on gallic (dioxysalicylic) acid.
1899 T. C. Allbutt et al. Syst. Med. VIII. 580 The remedies..found most useful are tar, chrysarobin, and pyrogallol.
1936 Jrnl. Royal Aeronaut. Soc. 40 32 The best stabilisers are hydroquinine and pyrogallol. They are not affected by the material of the container.
1992 W. H. Brock Fontana Hist. Chem. viii. 302 In 1853 the firm of Simpson, Nicholson and Maule was established..at Walworth, south London, for the manufacture of the fine chemicals used in early photography, such as pyrogallol, ether and collodion cotton for pharmaceutical use.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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n.1868