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Zolon red is an acid dye obtained in the enol form as the stable condensation product of glutaconic aldehyde with two molecules of 1-phenyl-3-methylpyrazol-5-one. Silver(l) replaces the hydroxylhydrogen of the dye to give deep blue precipitate of silver-zolon red compound.doi:10.1515/znb-1978-0420 fatcat:cosgyibwbneuvkaf2b5rvzdspu