The cleaning formula and basic procedures used for lacquer discs at the Archives of Traditional Music are detailed in the Sound Directions publication, page 27. Available at: http://www.dlib.indiana.edu/projects/sounddirections/papersPresent/index.shtml I don't know that it qualifies as definitive, but it is the result of research, much experience, and consultation with Eric Jacobs. Mike ---------- Mike Casey Associate Director for Recording Services Archives of Traditional Music Indiana University (812)855-8090 Co-Chair, ARSC Technical Committee -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Thomas Stern Sent: Thursday, July 10, 2008 10:55 AM To: [log in to unmask] Subject: [ARSCLIST] cleaning lacquers ("acetate") - palmitic acid deposit there was some discussion of this a while back, but I can't find any definitive statement of a safe and effective way to clean "acetates" with white deposits (assumed to be palmitic acid). Can someone provide a relatively safe, simple way to clean these discs? Thanks! Best wishes, Thomas.