Color of the 2x III

The white changes colour, I recently commented on this same phenomena as my ten year old 70-200 f2.8 IS and practically unused tripod ring it came with are completely different colours, yet they started out identical.

There are at least two original whites too, the MkII superteles and the MkIII TC's are a different colour to the older stuff, but they all change colour quickly with use.
 
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