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sulphite

British  
/ sʌlˈfɪtɪk, ˈsʌlfaɪt /

noun

  1. any salt or ester of sulphurous acid, containing the ions SO 3 2– or HSO 3 ( hydrogen sulphite ) or the groups –SO 3 or –HSO 3 . The salts are usually soluble crystalline compounds

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Generally though, the sulphite content is higher in sweet white wines rather than reds.

From BBC Nov. 20, 2023

From sulphite liquor, in the course of a decade, Chemist Howard and his helpers drew a reddish-brown goo: lignin.

From Time Magazine Archive

The rest comes out as a waste sulphite liquor,* a sirupy fluid.

From Time Magazine Archive

Upshot was that Union Bag's sulphite pulp plants had to be scrapped.

From Time Magazine Archive

Hence the neutral salt in which the metal is least oxydated must be named sulphite, and that in which it is fully oxydated must be called sulphat.

From Elements of Chemistry, In a New Systematic Order, Containing all the Modern Discoveries by Lavoisier, Antoine

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