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The uneven colouration is the result of foot rubbing.
Unless there is an impact these cranks should last a long time.
A stress fracture may not be readily apparent after an impact.
If components aren't kept clean:- there is less of an imperative to look after it
- difficult to do visual and safety inspections.
- there is less of an imperative to look after it
iC-
The uneven colouration is the result of foot rubbing.
You're looking at the heel rub, @Carabo is talking about the different colouration across the face of the crack.
@iC you don't happen to work for Miche do you? Just that "Unless there is an impact these cranks should last a long time." sounds very similar to "...they must have been crashed..." which was Miche's response to the 60 odd sets we had with cracks.
M_V
Going by the uneven colouration on the crack surface the crack might have started a while ago.