Archived posting to the Leica Users Group, 1998/08/18

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Subject: Re: [Leica] ROR, yet again/Acetone
From: "Bill Larsen" <>
Date: Tue, 18 Aug 1998 22:45:08 -0700

I would strongly suggest that you do not use acetone as a
lens cleaner.  You will most likely dissolve the coating and
if you are sloppy with it you will dissolve the lens cement.
Acetone is/was the base for commercial nail polish remover.
It will also leave a film on glass.

I don't know what you are cleaning in the laboratory, but my
first job was with a manufacturer of paint and varnish
vehicles.  We never used acetone for cleaning.  (Well,
instead we used a mixture of toluene and xylene...the
acetone was reserved for putting in our gas tanks to clean
the engine pint and you  cleaned the
valves...two pints and you burnt the valves).  I guess that
I'll have to get some ROR and sniff it.  Usually optics are
cleaned with a solution using a wetting agent.  In extreme
case they are cleaned with an acid or a base.  Solvents
would only be used in extraordinary cases such as tree sap
on the lens.  Then the solvent would probably be a toluene
based solvent (such as the commercial tar removers used for

With regards,
Bill Larsen

- -----Original Message-----
From: Michael Garmisa <>
Date: Tuesday, August 18, 1998 10:23 PM
Subject: Re: [Leica] ROR, yet again

Michael writes:

|I've been working in a chem lab all summer...  Acetone is
used to clean
|all the glassware (and some instruments)  before they are
used.  Acetone
|is an excelent, solvent why not use that to clean lenses?
Yeah, I know
|its a carcinogen but if you don't inhale the fumes you're
fine and anyways
|I'm sure many of the other cleaners are carcinogens too.
|Just wondering if anyone else has tried it as it seem to
make sense to me.
|Michael Garmisa <>