Operation Purple and Operation Topaz were international monitoring initiatives launched by the International Narcotics Control Board in cooperation with several States, relating to the chemical precursors potassium permanganate and acetic anhydride, respectively.
16. 紫色行动和黄玉色行动是国际麻醉品管制局与若干国家合作发起的国际监测举措，分别涉及化学前体高锰酸钾和醋酸酐。