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Dark circles around solder joints

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#65765

Dark circles around solder joints | 19 January, 2012

Two pictures. Dark circles around solder joints. leaded solder, water soluble flux, selective soldering and seeing these dark lines circling around solder joints. Can not remove this either. Any idea what is making this occur??? See attached photos

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#65767

Dark circles around solder joints | 19 January, 2012

We do selective soldering here so if you attach the pictures I might be able to offer some suggestions.

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