From: K (kerickso@acs.ryerson.ca)
Date: 09/24/01-09:31:53 PM Z
try old photocopier glass--if you can find and dismantle an old photocopier
(ha ha!)
i have an 18" square (1/2" thick) in a portable contact frame, and it is
wonderful for my cyanotypes, etc.
it has a slight green tinge, too (possibly quartz, not sure tho')
kris
----- Original Message -----
From: "ken watson" <watsok@frii.com>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Monday, September 24, 2001 5:11 PM
Subject: RE: UV Transparent Glass / $0.02 worth
> The only UV clear "glass" is made from quartz vs silica. The green color
is
> Iron in the glass. It is possible to get Iron free glass that in either
not
> green or much lighter green as seen from the edge.
>
> As for quartz glass ???? in large sizes
>
> ..-----Original Message-----
> ..From: Richard Knoppow [mailto:dickburk@ix.netcom.com]
> ..Sent: Monday, September 24, 2001 5:55 PM
> ..To: alt-photo-process-l@skyway.usask.ca
> ..Subject: UV Transparent Glass
> ..
> ..
> .. Some time ago I aquired a Morse contact printer. This thing was made
for
> ..printing from aerial survey negatives and has 39 little Argon UV lamps
in
> ..it. Not intense enough for alt use, but useful for slow silver paper.
> .. I got it cheap because the glass top had been dropped. I had a new top
> ..made from plate glass but its green and seems to have substantial
blocking
> ..of UV (judging from the diming of the fluorescence of the brighteners in
> ..plain paper).
> .. I was told that clear glass was available only on special order and
was
> ..very expensive.
> .. It seems to me that the UV transmission of glass is of interest to alt
> ..people. So, I am wondering what knowledge might exist on the list about
> ..kinds of glass available for, say, printing frames, which has better UV
> ..transmission than ordinary window or plate glass.
> .. The current thread on making a printing frame made me think of this.
> ..----
> ..Richard Knoppow
> ..Los Angeles, CA, USA
> ..dickburk@ix.netcom.com
> ..
>
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