Archived posting to the Leica Users Group, 2002/03/05

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: RE: [Leica] Optical toothpaste
From: ned@kajabbi.com
Date: Tue, 5 Mar 2002 06:48:17 -0500

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

Replies: Reply from Dr.Alexander.Kraus@gmx.de (RE: [Leica] Optical toothpaste)