Dear Technetters,

Thanks in advance for any insight you can offer on this issue ...

The issue is discoloration of LPI solder mask (ENPLATE DSR-3241 (MD)) that
corresponds to areas that were selectively wave soldered I believe using OA
flux.  There are pictures at the link below ...

http:\\www.eskimo.com\~ehare\EH_516

The discoloration does not map with ground planes or other internal
circuitry in the PWB.

What might cause this type of discoloration?

Thanks,
Ed Hare
SEM Lab, Inc.

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