A method for purifying extracted crude d-tetrandrine by dissolving the crude d-tetrandrine powder in ethanol, treating the solution with a decolorizing agent, filtering, reducing the filtered solution under heat and vacuum, cooling the solution, filtering it and drying the filtered cake to yield substantially pure d-tetrandrine. Each of the color separators includes first through fourth color-separating elements and first and second mirror elements. The plate is arranged by etching using at least two kinds of etching conditions which differ in magnitude relation between an etching rate of the fine particles in the region and an etching rate of portion of the plate excluding the fine particles in the region, to form the ink ejection nozzle and a surface of the plate in the vicinity of an ink ejection opening of the ink ejection nozzle. The transmitting unit may be hand-held by the animal’s handler or used with a headset and attached microphone. As the persulfate concentration is reduced rapidly in the water by the catalyzed reaction, the persulfate-containing product may be applied while the aquatic facilities are being used.