The flame coloring formulation containing quinone

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PROBLEM TO BE SOLVED : To provide a pyrroloquinoline quinone preparation ingestible or administrable at ease.SOLUTION : This pyrroloquinoline quinone-containing preparation includes pyrroloquinoline quinones expressed by general formula (I) or alkali metal salts thereof and a chelating agent. In formula, R, Rand Rare the same or different, and each represents H, phenyl or a 1-6C alkyl, aralkyl, alkylaryl, alkenyl or alkynyl.