Does anyone have experience with IPC-TM-650 method 2.3.38?  This test is specified as a manual way to detect surface organics.  Our first attempt found that even the untested solution left a visual residue.  The acetonitrile is the grade specified, but we are unsure of what is expected.  We do not have easy access to analysis equipment to determine the source of the residue.

Dave Kell

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