To provide a discharge printing agent that enables at least one of improvement in discharge printing performance and long-term storage stabilization.SOLUTION: The discharge printing agent includes thiourea dioxide and further includes at least one of (i) and (ii) as given below: (i) at least one salt selected from the group consisting of monocarboxylate, ascorbate and metasilicate and (ii) β-diketone.SELECTED DRAWING: None
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