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clear BE irid... qestion
Posted: Sat Jan 31, 2004 6:35 pm
by Lauralei
Hi there - sorry to bother you guys but I've searched for this in the archives and apparently I'm the only person who has a hard time telling the irid side on clear BE irid glass. When I was at Corning last year it was described as the "side that had a bit of a drag" indicating the metallic coating - but I've heard it described as the "rougher" side too. I am not getting it and some recent work is inconsistant due to this problem. Can you share any observations with me - besides disbelief? Ha - thanks - Lauralei
Posted: Sat Jan 31, 2004 7:03 pm
by Ron Coleman
I just looked at a sample of BE clear irid. Run your fingers over the glass and feel for a texture, the smoothest side has the irid coating. The non irid side will have a slight pebble finish.
Ron
Posted: Sat Jan 31, 2004 7:17 pm
by Ron Coleman
Another test, slide your fingers over the glass surface quickly like you're sanding wood.
The irid side will make a sound like sanding (if your hands are dry and rough) the non irid side will be almost silent.
Ron again
Posted: Sat Jan 31, 2004 10:43 pm
by Lauralei
Thanks a million Ron! that is a huge help!
Posted: Sun Feb 01, 2004 1:45 am
by Rob Morey
Take a shape pencil and put the point on the surface of the glass. If the refection of the pencil touches the tip that is the irid side, if there is a space then that is the non-irid side. Do it once then feel the difference sides and you will suddenly see the difference. Thank you Brock.
Rob
Posted: Sun Feb 01, 2004 2:58 am
by daffodildeb
I also use the "point" method for telling the iridized or dichro side of glass. I find a pin or very fine point tweezers works better for me than pencil points. Once you see it, it IS very obvious--the difference between looking AT the surface, vs. looking THROUGH the glass.