I think you'll find (joke grading apart) that the gold is not losing its colour. It's the effect of photo'ing through the slab, and if you look at the second pair of pictures taken from a greater distance, the gold shows its true colour. To be honest Peck, the 2nd pair of pictures, and i'm now talking about the OBV one, does'nt look as shite as it is close up, so it must be the EF stated on the coin. No seriously, i was joking there. I don't personally believe that it's the slab, why would the REV slabbed picture show some greying around 2 parts of the coin and not the complete coin? Why would'nt the same greying or discolouring not show on the OBV if it were just the slab?