1.The microscopic structure looked like it was cooked, too, to make the pigment more durable and colorfast.

它的显微结构看起来也像煮过，使色素更持久且不褪色。

2.No problem, madam. But I think the red sweater not colorfast. Would you like to have it dry cleaned?

没问题，女士。我那件红色毛衣可能会掉色，您洗吗？

3.In addition, the paper was colorfast and had a good reputation.

此外，报纸是不褪色的并有良好声誉。

4.And you can see how this process generates very little runoff and produces a colorfast pigment without the use of any chemicals.

你可以看到这个过程如何产生非常少的径流，并在不使用任何化学品的况下生产出不褪色的颜料。机翻