I sit next to guy with a Phd in the subject so I thought I'd better ask him. His answer was typically academic - 'it depends'. There are a number of different AR coats but his guess was it was likely to be magnesium oxide which may be removed with nitric acid - however you'd better check the compatibility with the substrate first. He also observed that AR coating is generally 0.25 > 0.50 micrometers thick so if you see a scratch it's almost certain the substrate is scratched also. Regards, > > -----Original Message----- > From: Jason W. Gregory [mailto:[log in to unmask]] > Sent: Saturday, December 14, 2002 1:24 PM > To: [log in to unmask] > Subject: [TN] OTC-Sunglasses coating > > I have a question involving sunglasses that I thought maybe the experts > here that work with optics lenses or the chemical gurus could answer. > > I have a pair of sunglasses that have gotten something on the lenses, I > don't know what. The reflective coating has been damaged extensively. The > company that manufactured these sunglasses has been bought by someone else > and there is no way to get my hands on replacement lenses. These are VERY > expensive shades, keep in mind, so I really want to fix these. What would > be the best chemical to just go ahead and strip the remaining reflective > coating off of these? If I can accomplish this, then would there be any way > to recoat the reflective coating? or send them off for recoating??? Any > help is appreciated. > > Thanks, > Jason Gregory > > --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text in > the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- -- Eric Christison Mechanical Engineer STMicroelectronics 33 Pinkhill Edinburgh EH12 7BF tel: +44 (0)131 336 6165 fax: +44 (0)131 336 6001 --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------