Good question! So many ways to think about it.
Maybe you could compare it to a star. What color is a blue star? Well, it is obviously blue, dummy. But if you were looking at it from the earth's surface with naked eyes it would appear to be the same color as every other star in the sky. Obviously, in this instance, the inability to actually percieve the color of something doesn't make it colorless.
Just because we lack the ability to percieve a certain characteristic of something doesn't render that characteristic nonexistent. An orange in the dark is still orange, you just can't see it to verify.
Or, like phred sed:
Since color is a function of light, if you took all light away, than the color doesn't exist.
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