Ok guys, thanks!
I have some ceramic ones, and some of these black fiber ones. Just in case, I submerged both types in HCl (separately) over night - no colour change.
So I will follow your advices and incinerate the black CPU body after removing the pins with heat or with nitric, then straight to AR.
EDIT: I have done exactly what I wrote, and now my AR is extremely green:
This is due to the iron right? I have seen gold foils actually come off the pins, floating around, and be gone the next time I look after the solution (10-15 mins apart)
The solution is now at 100ml, I will use HCl rather than more nitric to compensate for saturation.
Can you tell me if I just can use SMB in the solution as is when it's done, or if I have to deal with the other metal(s) first?
After completion I think about diluting it with water, but this could slow a eventual cementation wouldn't it?
You do not have the required permissions to view the files attached to this post.