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| a preparation containing an insoluble dye converted by reduction into a soluble leuco base, or a vessel containing such a preparation |
| any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals |
aromatic compound n.
A cyclic compound containing at least one benzene ring and characterized by the presence of alternating double bonds within the ring.