Retrobrite can have damaging effects on colored labels and logos. I recently de-yellowed all the plastic parts on the outer case of a 8100. The colored apple logo on the front lost its colors in the process, and is now shiny silver. I think the stripes of color on the apple were a decal, judging from the way it came off. If I had known it would do that, I would have covered it with something first. On the other hand, the silver apple looks very modern, especially on the completely neutral platinum background (with all yellow gone)