Interesting discussion on using rubber erasers to "polish" fiducials.....

I presently have a customer who has to polish his fiducials in a similar
manner before his vision system  can locate our boards.  I want to try and
help this customer get out of this practice.  The board has a HASL finish.

Can anyone shed any light as to the root cause of this issue and reccomend
solutions (preferrably board related fixes - if there are any).

 I have also read in the forum that gray scale vision systems can remedy this.

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