RE: [ATM] Does exposed Pyrex lose polish over time?

["Richard Klappal" <klappal@xnet.com>]

Vaseline won't be touched by water, in any form, nor by simple, dilute acids
or by simple alcohols. It takes benzene (C6H6), chloroform, ether, naphtha,
carbon disulfide, or some oils. Many of these have their own toxicities and
flammability dangers.

Probably the safest and simplest way to get it of is 1st, gentle application
of elbow grease to get the Vaseline to as thin a layer as possible, then use
old fashioned cigarette lighter fluid (naphtha) to dissolve the remaining
film. Follow this with very dilute dishwashing liquid in distilled water
(perhaps with a few drops of isopropyl alcohol).  This last formulation is
not unlike some lens cleaning fluids.

Obviously, the cigarette lighter fluid is extremely flammable. Treat
accordingly.

Rich Klappal



-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
Of Richard Schwartz
Sent: Monday, 03 May, 2004 18:36
To: greg emery; atm@atmlist.net
Subject: Re: [ATM] Does exposed Pyrex lose polish over time?


I tested this idea.  I smeared some vaseline on a microscope slide and then
swabbed it with concentrated HNO3.    You are right!   The HNO3 did nothing
to the vaseline, and neither did the tap water I rinsed with.   So the
cleaning process must require distilled de-ionized water.  I burned the
cotton swab in the fireplace, and it was really cool how it flared up!  I
bet you could make firecrackers outta that stuff.

. . . Richard


> [Original Message]
> From: greg emery <glass_grinder@yahoo.ca>
> To: <atm@atmlist.net>
> Date: 5/3/2004 4:47:21 AM
> Subject: Re: [ATM] Does exposed Pyrex lose polish over time?
>
>  Hello All:
>
> If it is a combination of chemicals and dirt losely in
> contact with the surface or adsorbed to the surface
> then maybe a swabbing with conc. nitric acid ( which I
> would repeat 1 or 2x) then copius rinsing with  water
> ( distilled deionized is best, followed in order of
> preference by reverse osmosis, then distilled, then
> rain water and lastly tap water).
>
> This should remove any and all films, surface
> contaminants, oils, greases and a multitude of
> inorganic materials.
>
>
>
> ttfn
> greg
>
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