Re: Frosted Glass

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From: terry roth (terryroth@earthlink.net)
Date: 07/16/01-09:00:35 AM Z


I needed a 5x7 gglass in a hurry once. I put strips of the dull, "frosted"
scotch tape on. Worked just fine, took about 5 minutes or less. And the
horizontal grid lines were built in!!!

----- Original Message -----
From: James Young <jamiehy@globaldialog.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, July 16, 2001 10:38 AM
Subject: Re: Frosted Glass

> >I'm sure a chemical etch would work, but here's what I did:
> >
> >I got two pieces of glass (just ordinary window glass) of the size
> >that I needed, put some automotive valve grinding compound between
> >them and started grinding them together in a somewhat circular
> >pattern. After doing this for a few minutes, I washed off the
> >grinding compound, dried the glass and looked to see how uniform the
> >grinding was. I then put more grinding compound on and put pressure
> >on the areas that were still shiny.
> >
> >The first time I tried this, it took about a half hour to get a good
> >5x7 ground glass. Later, I made a 4x5 in less than 10 minutes.
> >The finish is a bit more coarse than modern camera glass, but that
> >could be improved by using a finer grade of grinding compound, like
> >the compound sold for making telescope mirrors. (600 grit, or so,
> >in US terms. I think the 600 refers to the number of grains of
> >compound per inch, so its probably called something different in the
> >rest of the world) I used the valve grinding compound because it
> >was easy to buy.
> >
> >Of course, be careful handling the glass since the edges are sharp.
> >
> >Bill
>
> A good source for grinding grit is the local rock shop. Most rock
> hops sell grit for polishing stones.
> I just got some 600 grit material for about $4.00 -Way more than I
need.
> Jamie Young


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