他们生产的各种颜色是由额定寿命和耐久性。
They are produced in a wide variety of colors and are rated by their lifespan and durability.
耐久色：能够抵受空气或某类化学品的影响而不变色的油墨或颜色材料。
Colour fast: An ink or coloured material whose colour is not affected by exposure to air or specified chemicals.
耐久色：能够抵受空气或某类化学品的影响而不变色的油墨或颜色材料。
Colour fast: An ink or coloured material whose colour is not affected by exposure to air or specified chemicals.
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