To produce bag. In addition, the manufacturing process and then still need to be printed on the bag, which the majority of heavy metal coming from the print colors. By the combination of the colors that are printed with elements of heavy metal compounds such as CrO3, and CdSO4 etc. However, when the test is still in danger, then the safety criteria, that is, < 0.25 mg/kg ≤ 100 mg/kg standard. For the Cd, etc.
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