The colour in this material does not fade.

这布料不褪色。

《新英汉大辞典》

But another machine in the plant, which USES a laser to scan the passing material, can sort plastic by type and colour with great accuracy.

但是工厂里的另一套设备则不一样了。其利用激光对经过的材料进行扫描，按照塑料的种类和颜色进行分类，且准确率极高。

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When the strain is removed, it forms a ripply surface, and the spacing of the ripples affects the colour of the laser light, which varies as the material is stretched.

当这种材料的表面产生张力时，就会产生类波纹状的表面，并且这改变还会影响激光器发出的颜色，并且会随着张力的改变而变色。

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Alex (his name supposedly an acronym for Avian Learning Experiment) eventually learned the names of about 50 objects, knew the numerals from one to six, could perform simple addition and used categories such as similarity and difference, shape, colour and material.

ECONOMIST: Alex the African Grey

The colour has been used in ribbons and other publicity material since their daughter's disappearance.

BBC: Mid Wales

Dr Feld also has plans to use beams of different colours, since each colour has a slightly different refractive index in a given material.

ECONOMIST: Microscopy