"Why is it not red?" or "Why isn't it red?"

Question

If I want to ask the reason why something is not red, which sentence is the correct one?

"Why is it not red?" or "Why isn't it red?"

Thank you!

Answer 1

British English:

• "Why is it not red?" implies a surprise: usually things of this kind are green.
• "Why isn't it red?" is more of a question: "For what reason this thing is not red?" (I would have considered it as possible.)