lightfast

Permanent inks : Inks which do not fade. Also called Lightfast inks.

耐久墨: 不会褪色的油墨. 亦称耐光油墨.

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Lightfast ink: Ink that will fade less than normal ink on prolonged exposure to strong light.

耐光油墨: 在强光照射下,颜色较普通油墨耐久,变淡的程度较低的油墨.

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