RE: BL vs BLB tubes for cyanotype

Hi Mark,
 
I am not Sandy, but yes you do need a spectrophotometer, a sophisticated one, which you can make scan from say 250 to 500 nm, and measure the abssorption (or transmission) of your glass sample. I do have acces to such equipment, so if peopel want to scan a small piece of whatever glass (say 1*4 cm ), let me know..
 
best,
 
Cor

-----Original Message-----
From: Ender100@aol.com [mailto:Ender100@aol.com]
Sent: donderdag 17 november 2005 6:57
To: alt-photo-process-l@sask.usask.ca
Subject: Re: BL vs BLB tubes for cyanotype

Sandy,

What instrument would one use to measure the spectrum of light passing through some material such as the glass you are talking about? Where might one get access to one? Would my doctor's colonoscope work?

Would it be a Spectrophotometer?

Thanks,
Best Wishes,
Mark Nelson
Precision Digital <http://www.precisiondigitalnegatives.com/> Negatives
PDNPrint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com <http://www.markinelsonphoto.com/>

In a message dated 11/16/05 9:18:48 PM, sanking@clemson.edu writes:

Well, not quite 909%. The intended percentage was 90%.

Sandy

Best Wishes,
Mark Nelson
Precision Digital <http://www.precisiondigitalnegatives.com/> Negatives
PDNPrint Forum @ Yahoo Groups
www.MarkINelsonPhoto.com <http://www.markinelsonphoto.com/>
Received on Thu Nov 17 03:55:23 2005