There was an excellent paper at the last IPC meeting by Jill Steeper of Shipley titled " Bacterial Contamination of Chemistries Used in PWB Manufacture or Are there bugs in your process " that you might want to read . She is at 1-508-229-7345 I believe. ---------- From: Andy RJ McKean To: [log in to unmask] Subject: [TECHNET] Micro-organisms in rinses