How do you ask what color want in French?

The way you ask "What color do you want?" in French depends on the context and formality:

Informal:

* Quelle couleur tu veux? (What color do you want?) - This is the most common and direct way to ask.

* De quelle couleur tu veux? (What color do you want?) - This is a slightly more formal variation.

Formal:

* Quelle couleur désirez-vous? (What color do you desire?)

* De quelle couleur avez-vous envie? (What color do you feel like?)

Example:

* "J'aimerais acheter un nouveau pull, quelle couleur tu veux?" (I'd like to buy a new sweater, what color do you want?)

Remember to adjust the formality based on your relationship with the person you are speaking to.