Permanent inks : Inks which do not fade. Also called Lightfast inks.
耐久墨: 不會褪色的油墨. 亦稱耐光油墨.
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Lightfast ink: Ink that will fade less than normal ink on prolonged exposure to strong light.
耐光油墨: 在強光照射下,顏色較普通油墨耐久,變淡的程度較低的油墨.
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