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Discoloration along the edge of traces with OSP finish.

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#56503

Discoloration along the edge of traces with OSP finish. | 12 September, 2008

Can someone let me know what is causing this black coloration around the pads? It is on the edge of all pads all over the board. The surface finish is OSP. I don't have any solderability issue. But the stencil printer is having trouble with picking up the fiducials. The discoloration comes off with the pencil eraser. Thanks in advance.

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#56510

Discoloration along the edge of traces with OSP finish. | 13 September, 2008

Lemme tell ya, those are weird looking pix.

If OSP boards have not been dried properly prior to bagging and sealing, water can leak from via and ruin the OSP, which will turn black.

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