The question for asking colors is constructed similar to the way it's done in English:

    Eng: What color is XXX?

    Tr: XXX ne renk? (Here, ne is what and renk is color)

The answer is also simple:

    Eng: XXX is red.

    Tr: XXX kırmızı.

However, note the difference in word ordering when you want to add a color (or any adjective) to an indefinite noun.

    Eng: A red XXX.

    Tr: Kırmızı bir XXX. (Not 'Bir kırmızı XXX')

Now, try to understand the following sentences. Hold the mouse pointer on a sentence to see its English translation.

    - Bu araba açık mavi.

    - Evim koyu kırmızı.

    - Gözlerin ne renk?

    - Beyaz bir gömlek aldım.