CPU Lapping #2 (with shocking pics)

[celemine1Gig]

the grey IHS is actually tin plated copper, since he already lapped the IHS, the tin is gone

Nickel, not tin. Just have a look at one of the cpu datasheets. It explicitly states the materials used.

And BTW, I don't really understand the whole "this is so shocking" part here. All this because of a little copper discoloration due to the TIM getting hotter than usual. Just a small chemical reaction between the TIM and the pure copper. Nothing more, nothing less. So, no need to worry. As already said, now you know that the shutdown temp is there for a reason.