By that logic the sky is near-Planck length ultraviolet, because if I put a sufficiently large quantity of it immediately beside a supernova it goes way past bl

By that logic the sky is near-Planck length ultraviolet, because if I put a sufficiently large quantity of it immediately beside a supernova it goes way past blue. Color is a property something has under certain conditions, it is not a property of what that something is under all conditions.