You have to confirm that in this bag is free of formaldehyde

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You have to confirm that in this bag is free of formaldehyde and its azofree 你必须确定这个袋子里没有(不含)甲醛物质或含甲醛的偶氮颜料 - You have to confirm that its also free of heavy metals 你也必须确定这个袋子里没有(不含)重金属。

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