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The present invention is related to a composition, which comprises alumina, at least one of silica and titanium oxide, at least one of platinum, palladium, iridium, rhodium, and compounds thereof, and at least one of silver and a silver compound in order to provide a powder and/or a composition and a fiber having incorporated thereinto a powder and/or a composition, being capable of uniformly emit far infrared rays at high efficiency as well as having excellent durability and transparency. In addition, the present invention is related to a mixture containing the above composition and a synthetic polymer material, a fiber having incorporated thereinto the above mixture, and fiber products using the above fiber.