求翻译：Every dye has its own characteristics, so our colour technicians compare the colour under light conditions at a setting of D65 as a primary source, which is the standard British daylight source. They also assess fluorescent lighting as used in retail stores; and tungsten light, as provided by traditional household bulbs. Pigments hold their depth of colour more than chemical dyes, and are used when high lightfastness is required.是什么意思？

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