Originally Posted by Arctucas
Thank you for the clarification.
If improper cleaning/contamination is the reason for the discoloration, I wonder why I have only noticed it from using ICD and not other TIM such as MX-4, Shin-Etsu 7738D, or T-C 0098 or Quantum?
I always use the same cleaning method; 91% IPA on a paper coffee filter.
People can post pictures of any staining here they encounter if they wish - can not analyze what you can not see, lets get some feedback I am OK with that.
post em up
The oxidation is only 400 to 600 atoms thick and has no effect on performance and is a cosmetic that is buried from the light of day so I wonder at people preoccupation with it. In any event it can be easily removed for those perfectionists with any thermal compound as most compounds, AS5, Shin Etsu, MX4 etc. contain aluminium oxide (what they make sand paper out of) and are natural lapping compounds, a little dab on a clean cloth and 10 seconds of vigorous polishing and it will be gone.