前面的寒暄你自己编，涉及到colour的，可以用这些：

What colour is it/this/that?(提问单数物体）

What colour are they/these/those?(提问复数物体）

They are blue/white/browned/yellow/black.

It's blue/white/browned/yellow/black.

What colour is the coat?(用What colour +be+ 定冠词+物体，对特指的某物颜色提问）

It's blue/white/browned/yellow/black.