金相学是一门技术学科，但是也是一门艺术，色彩让这么艺术可是实现更丰富的技术表达。

Metallography is a technical discipline, but it is also an art, Color makes such art a richer technical expression.

彩色蚀刻剂对晶体取向敏感，可以揭示晶粒是否具有随机的或优选的晶体结构。它们对成分和残余变形的变化也非常敏感。此外，彩色蚀刻剂通常对某些相具有选择性，这在定量显微镜中是有价值的。

Color etchants are sensitive to crystallographic orientation and can reveal if the grains have a random or a preferred crystallographic texture. They are also very sensitive to variations in composition and residual deformation. Further, color etchants are usually selective to certain phases, and this is valuable in quantitative microscopy.