Allen Hertz wrote:
> 
>      Pat,
> 
>      That concept works well. The term "Pink Pearl" was coined as the
>      processes since one would purchase a number of those little pink
>      erasers and go scrub fiducials. This was effective for HASL or other
>      tin-lead finished boards.Gold or OSP finsihes generally do not require
>      this operation.
> 
>      An alternative used was to place lighting under the board and change
>      the PCB layout by removing all metallization and resist around and
>      under the fiducial. The "backlighting" provides a silhouette,
>      eliminating any variations due to reflection. This is a major task,
>      especially for various board sizes.
> 
>      Regards,
>      Allen Hertz
>      [log in to unmask]
> 
> ______________________________ Reply Separator _________________________________
> Subject: ASSY: Polishing Fiducials
> Author:  [log in to unmask] at ftl03
> Date:    11/12/96 12:48 PM
> 
> >From the What Will They Think Of Next (WWTTON) dept:

	Another request we`ve had in this light (sic) is to leave
	the fiducials as bare copper, allowed to oxidize.  Brings
	an OSP-look to a HASL PWB.

	Regards,
-- 
 
      Jeff Seeger                             Applied CAD Knowledge Inc
      Chief Technical Officer                      Tyngsboro, MA  01879
      [log in to unmask]                               508 649 9800

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