Re: frames/UV transmittance.. -Forwarded
Bob_Maxey@mtn.3com.com
Wed, 01 Apr 1998 14:19:52 -0700
..about a year ago I did some testing of "normal" glass and crystal
glass: the crystal glass allows transmission of UV. standard glass cuts
off UV a an certain wavelength (have to look that one up, I thought about
300nm, not sure..). Tested both types of glass on cyanotype and VDB, the
crystal printed faster, but not dramatic (if I remeber correctly about
10-15%)..
There is a tremendous variety of sheet glass available. Unfortunately, not
too much technical info about its characteristics. No such thing as
'Normal' Glass though. Incidentally, Crystal glass contains Lead; that is
what makes it so clear. This material can be added in various quantities by
the manufacturer.
RM