I know more about frame shop glass than plate glass...I only order 'plate' glass in the form of 1/4" mirror for people who don't like the thinner kind.
The 'brand name' glass I get in boxes is float glass...rarely, one finds a spot of tin (the glass is, or at least used to be, floated on molten tin) on the surface.
Re: Flatness...I have made ground glass with it and never noticed anything 'funny' with grit about 500 or coarser. However, I tried 5 micron ( ~1000 grit ) Aluminum Oxide and was utterly frustrated with the 'waves' or ripples that were in the glass.
Say, does one put emulsion on smooth glass, or etched/ground glass for negative plates?
Thanks
Murray
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Received on 06/22/06-08:15:26 PM Z
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