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FW: Alt print on Glass?

  • To: alt-photo-process-l@usask.ca
  • Subject: FW: Alt print on Glass?
  • From: geoff chaplin <geoff@geoffgallery.net>
  • Date: Tue, 19 May 2009 07:30:32 +0100
  • Comments: "alt-photo-process mailing list"
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I’ve used carborundum to grind telescope mirrors. You can get a variety of grades and starting with the coarsest working down to the finest you can get a perfectly flat (or evenly curved) surface. However you only need to provide grip so one grade alone should do but no idea whether the finest or the coarsest will be best for this application. You will need a flat surface to put the glass on – and probably with a thin layer of something which gives a little to absorb minor variations in the reverse of the glass – and will need to make a tool to rub over the glass with the carb in between For mirror grinding we use another piece of glass bonded to a piece of wood with bitumen.


Not sure where to get carb now but Google throws up a good list. Traditionally this task is performed in a freezing garage mid winter …… Good luck.


Geoff Chaplin

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From: ender100 [mailto:ender100@aol.com]
Sent: 19 May 2009 05:43
To: alt-photo-process-l@usask.ca
Subject: Re: Alt print on Glass?


I have used carborundum (fairly fine) to give a very nice matte finish to glass.  If you mix a little oil with it, or water, you can make a slurry that will do the trick.  You need something that provides a hard, flat surface to grind the glass with.  A flat, hard wooden block with a handle will do—or you can use another piece of glass or metal.  Just keep going over the surface evenly in circular motions until you have the surface you want.


Another trick for cutting holes in the corners to hang a piece of glass it to use an electric drill with a short piece of copper tubing substituting as a drill bit.  you cut a couple of notches in the the business end of the copper tubing "bit" to aid in the cutting action of the carborundum.  Next you use clay to make a little dam around the spot where you want to cut the hole. in the dam, put some carborundum and oil and then start drilling away with gentle pressure.  Soon you have a nice round hole cut in the glass without it breaking.  This method can also be used to cut holes in other items that are made of glass, such as bottles, etc., though I find just popping the cap off a bottle of beer is a lot easier and less messy method to get to the contents.