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The reaction of trichloro-s-triazinetrione, trichloroisocyanuric acid, and hydrogen peroxide produces cyanuric chloride and oxygen gas. Cyanuric chloride is a toxic and corrosive gas, so it is important to take safety precautions when handling these chemicals. The reaction should be carried out in a well-ventilated area, and personal protective equipment, such as gloves, goggles, and a respirator, should be worn.