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m-C6H4(OH)2, one of the dihydric phenols, a colorless crystalline solid made by sulfonation (see sulfonic acid) of benzene followed by fusion with sodium hydroxide. Resorcinol is used to make adhesives, methanal (formaldehyde) resins, dyes, explosives, photographic developers, and as an antiseptic. Molecular weight 110.1, melting point 111°C, boiling point 281°C.

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