Thanks for posting the photos, Steve.

The photos look like peeling off of overhanging material like Tin - they
don't look like scrubbing debris.

The areas showing the conductors show pronounced grooves across the
conductors.

This remains a puzzle, but my previous indictment of the scrubbing process
coupled with inadequate removal of the tin/lead etchresist are the best choices
for sources until you can tell us more about the samples.


Susan Mansilla
Robisan Lab

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