From: Marianne Romansky Process Development, Celestica Subject: ASSY:Solder mask staining Are IPC-TM-650-2.3.38 and 2.3.39, "Surface Organic Contaminant Detection Test" reliable methods for determining whether organic or inorganic contaminants are present on the surface of a PWB? Is the "No residue should be seen.", paragraph 5.3.2, criterion attainable in testing boards produced under ideal conditions? These questions arise from a search for the source of staining on gold wirebond pads. Thanks in advance. Marianne Romansky Phone 1(416)448-6284 Celestica Inc. [log in to unmask] fax -4736 844 Don Mills Rd., MS34/178, North York, Ontario M3C 1V7 Canada