John Austin wrote:
>
> Thomas H. Hogan wrote:
> >Methanol (CH3OH) not isopropyl alcohol, not ethanol
> >Just use methanol so you don't destroy the coatings.
> >You can obtain methanol at most hardware store in the
> >USA where it is called either "denatured alcohol" or
> >"wood alcohol"
>
Dear John Austin:
I do not know if it is safe to use ethyl alcohol or
the 4% MeOH(CH3OH) : 96 0.000000E+00tOH (CH3CH2OH) denatured alcohol mix
on the coatings. The reason that it is called denatured is that
when EtOH is heated under pressure it "denatures" to MeOH (methanol)
which is poison and can cause blindness if ingested.
Perhaps John Hermanson can tell us or someone
should call Mount Olympus!
I think that I did damage the coatings on a Hoya 2X doubler
when I immersed it into 70 0sopropyl "rubbing" alcohol
after dropping into a creek while photographing water striders.
After using the Isopropyl alcohol on this doubler a "yellow-ish"
"stain" appeared.
BTW: Frank, if you are reading this, the Pond's cold cream
was purchased at a Sav-On's drugstore and was listed as
"Original Formula" deep cleanser. The Pond's institute
has an 800 number (1-800-743-8640) The net wt. 3.5 oz
(99g) is more than a lifetime supply considering the
small amount that would be used on a lens.
I would suggest you try looking for it at a "De Hema"
(Dutch equivalent of Woolworth's store). There was
one in Amsterdam the last time I was there. The clerk
might "bat an eyelash" at you though, especially if you
ask him for the "Henk discount" !
Hank Hogan
> Hank,
>
> I'm a bit confused. I looked at my can of denatured alcohol (from the
> hardware store) and it says that it contains denatured ethyl alcohol,
> and emphasizes that it contains less than 4% methanol. I checked other
> brands from different stores with the same results. Comments please.
>
> Regards,
> John Austin
> Oakland, CA
--
Hank Hogan --
BTW, I'm looking for a job as a biological science research
technician. If you know of anyone who might need a technician
with my skills (see resume on my home page) please let me know.
--
Thomas ?Hank? Hogan
Biologist, Photographer, Web Designer
mailto:flzhgn@xxxxxxxxxxxxx
http://www.netcom.com/~flzhgn/indexc.htm
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