Archived posting to the Leica Users Group, 2002/03/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Have you tried Glass Wax. I have seen nothing that removes anything from glass better. It doesn't seem to scratch but DON"T rub , just wipe a bit on. >-- Original Message -- >Date: Tue, 05 Mar 2002 04:47:23 +0000 >From: Javier Perez <summarex@yahoo.com> >To: leica-users@mejac.palo-alto.ca.us >Subject: [Leica] Optical toothpaste >Reply-To: leica-users@mejac.palo-alto.ca.us > > >Does anyone know who makes optical toothpaste? > >Dr.Alexander.Kraus@gmx.de wrote: >> >> > >> > >As a practicing dentist for the past 25 years, I can tell you that >> > >toothpaste not only will remove just about any lens coating, but will >> > also remove a fair amount of the lens element itself. You'll have a cloudy >> > lens in no time! >> >> I don't dispute the abrasive character of toothpaste. But I can also ensure >> you that I have sucessfully used toothpaste to remove an old defective >> coating without getting a cloudy lens. I used a special toothpaste for >senstive >> teeth which contain less pumice (or finer paritcles). One time I messed >a lens >> up, but this was when I used a power tool for polishing. If you make a >slurry >> of toothpaste and some water and wipe the lens without too much pressure, >it >> takes quite a while untile the coating is polished of - and here we are >> talking about a layer of approx. 300 nanometers. I frequently check the >appearance >> of the surface and as soon as the coating is gone, I stop wiping the lens >> and wash the lens with water until the toothpast is completely gone. Even >with >> a 10x magnifier I wasn't able to see any cleaning marks or cloudy surfaces. >> >> > >Toothpaste contains varying amounts of pumice and is very >> > >abrasive. I've seen patients over the years who are so aggressive with >a >> > >toothbrush and toothpaste that they have removed tremendous amounts >of >> > >tooth enamel such that the tooth has snapped in half due to >> > >toothpaste-induced erosion. Tooth enamel is far harder than any lens >I've >> > >ever seen. >> >> What you describe is the result of years of abuse and the addtional impact >> of agressive chemicals (acids) that are formed in the mouth. >> >> > >As an aside, toothpaste can remove scratches in your car's >> > >paint or clearcoat quite nicely if used in small amounts on a wet rag. >> >> I know. Toothpaste is a perfect allround polishing aid :-) >> >> Alex >> >> -- >> GMX - Die Kommunikationsplattform im Internet. >> http://www.gmx.net >> >> -- >> To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > >_________________________________________________________ >Do You Yahoo!? >Get your free @yahoo.com address at http://mail.yahoo.com > >-- >To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html