what color
「何色」 has another reading with different meanings.
how many colours
好きな色は何色ですか。
What color do you like?
この花は何色に咲くのか楽しみだ。
I'm looking forward to seeing what color this flower will bloom.
子供に何色の服が似合うかわからなくて迷った。
I wasn't sure what color of clothes suited the child and couldn't decide.