Hi all,
anyone who have this experience?
A. Peel fresh PWB: high force needed, white stuff left on board. Soft like butter. Copper underside yellowish.
B. Peel used PWB: much lower force needed, no white stuff left on board. Copper underside brown-blue-redish.

Reason for asking is this. We suspect that something bleeds out from beneath the copper traces during the
VIGON cleaning. Not much, but sometimes creating kind of 'grease' along the copper traces. Therefore, I'm 
interested in the interface between the copper and the teflon. What stuff can there be that changes from white to colourless, and may be dissolved by VIGON. 

Sending two pics to the always and amazingly tolerant, patient and positive S.G.

Ingemar Hernefjord
Ericsson Microwave Systems

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