I called the manufacturer of our microscope slides to follow-up on Jim's comment. Paul Sanford of Erie Scientific (who purchased the 'Gold Seal' line from Becton Dickinson Labware), at (800) 258-0834, is an expert at the transmission of their glass. The glass is soda-lime silicate (common window glass), except that it has "reduced iron" (not quantified). For 1mm slides of the type I am aluminizing, the normal incidence transmission is characterized as follows: wavelength (nm) % transmission (normal incidence) 345 .90 320 .786 310 .655 300 .453 290 .232 280 .0773 Paul Sanford said that there were no mass producers of microscope slides out of borosilicate glass, but this is unverified as of today. I hope this information is useful toward understanding the consequences of the glass I am currently using. -Steve Knapp jeg@astro.Princeton.EDU wrote: > > Most microscope slides these days are borosilicate glass, which is > quite transparent to 3000, (much more so than DIS is), so check > what you have; it may be OK. > > jim APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 24 in the apo35-dis archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-dis/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-dis@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO