The sky doesn't contain any blue pigment, either. And a blue-eyed person has no blue in their irises. You're referring to pigment; there is no blue plant pigme

The sky doesn't contain any blue pigment, either. And a blue-eyed person has no blue in their irises. You're referring to pigment; there is no blue plant pigment, true, but that seems a little pedantic, even if it's interesting. Plenty of flowers reflect blue light, which is what people mean when they say an object is "blue".