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Photograph of vials for extraction of Malachite Green dye with a mini-PEP. A, vial containing a porous nylon bag which, in turn, contains 10 mg of MP-adsorbent, and also a solution (1.8 mL) of Malachite Green in 4% acetic acid that has just been added. B, equivalent vial after shaking at 230 oscillations per minute for 8 minutes.
