We are currently doing an "Acetone Test" on our incoming PWB's to test for solder mask cure.
Our test entails saturating a swab with acetone and rubbing it on the mask.

Does anyone know where this test comes from?  Is it a documented IPC test?

Also, if we do see any residue (i.e.:  green or blue discoloration on the swab), what does this
tell us and how much is enough to deem the test "failed"?

-Carrie

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