I bought a White MB on the first day of release, and promptly returned it for a Black MB the next day, seeing that it was yellowing around the track pad. So no, it does not necessarily take days or weeks. This was all in less than 24 hours.

And yes, my hands were freshly cleaned every time I used it during that 18 hour period.

Both the white and my current black MB had no noise issues and ran warm, but nowhere near the processor temps of the MBPs of the time. The machines were both almost dead silent. Despite my issue with the white turning yellow (which I am sure they will sort), I recommend these laptops without hesitation. They really are great.

Maybe Apple wanted them Orange at first and then changed their minds and sprayed them white???

What do you reckon.

That or maybe sweat reacts with some chemical in the paint.

It's great to see Apple responding so promptly and not trying to cover up the issue.

I think the cause of the problem is heat causing a chemical reaction in the plastic. It would be interesting to know if the affected areas are hotter than the rest of the laptop.

I doubt is has to do with heat b/c of the fact those are the cool areas of the laptop. Because only a select number of people seem to be having the problem it must have something to do with the composition of their sweat. Maybe the pH? Some people have very acidic sweat. Fortunately I have yet to see any stains on my 4 week old white macbook.

Mike B

I wish that Apple still had their own factories. If they had, they could more easily resolve quality issues at the assembly line. If there is contamination involved of the plastics, it now takes much longer to correct it. Apple now has to go through the outsourcing channels. Oh I hate that everything has to be outsourced. Okay, prices have gone down, but Apple has got to put quality control on their agenda.