Woe, Wee,
Have seen something like. In our case it was a repetetive mechanical
damage, kind of small imprint, was quite harmless.
Inge
>
> Hello,
>
> The suspect is completely flat and smooth to touch. An interesting
> observation is that though it appear at the same location for all the
> 10pcs
> of board, the size of the image tend to get smaller and smaller if the
> boards are arranged starting with the largest image. It can't be soda
> strawing as it is not on trace. It can't be pink ring as it is not
> around
> hole. What can it be? What is the likely cause?
>
> Will ask Steve to put it up. Kindly take a look. Your opinion is
greatly
> appreciated.
>
> Regards,
> Wee Mei
>
>
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