prov:value
| - Additives other than the laser color developing agent (e.g., a filler, a pigment, a dye, an antiaging agent, an antioxidant, an anti-static agent, a lubricant, a plasticizer, a thermal stabilizer, X-ray contrast medium) can be added to the polymeric material used in the present invention in such a manner as not to impair the objects of the present invention.
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