I have an old Chess set which has been in storage in what would appear to be less than ideal conditions. (Photo taken with flash.)
One half of the box (on one side only, ie the half that is not shown in the image is as fresh as the left side here) is very dull looking. Other than the colour there is no obvious damage. I do not know what has happened to it.
What is the easiest way to achieve uniform appearance?
Edit: the "damaged" side was uppermost I believe, and there were other things on top. I did not notice excessive amounts of dust around it. Wiping with alcohol does not have any effect.