Without color, it has no color.

It is a formal subject, which is placed at the beginning of the sentence instead of the real subject behind it, and there is not doubt-whether the question is a verb or a noun, if the question itself is denied, the object clause or appositive clause behind it will be guided by it; When the doubt itself is affirmative, the following object clauses are guided by if or when.

Appositive clauses are guided by whether or not, because if or not is used to guide noun clauses, if only the object clauses of verbs can be guided, the object clauses, subject clauses, predicative clauses and appositive clauses of prepositions can all be guided by whether or not. I hope it helps you.