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取一个小的表面皿,放入少许(约4~5粒)高锰酸钾晶体。将其置于装有一薄层水的直径约为12cm的培养皿里,另取一个干燥的直径约为9cm的培养皿在其内侧的半边用毛笔涂
Take a small watch glass and add a little (about 4 to 5) potassium permanganate crystals. Place it in a petri dish with a thin layer of water approximately 12 cm in diameter. Take a dry petri dish with a diameter of approximately 9 cm and apply a brush to the inside half of the dish.