RE: test images: screw-in BLB UV box--1000 watt bulb?

Hi Charles, I use a mercury vapor lamp, 400W I think (not at work so I
can't check) and suspended about 12-15" above my benchtop. This gives
exposures of around 10 minutes with cyanotype. It does get quite warm,
but not hot enough to damage a print in that time. I've been doing night
classes with some beginning students and we did some cyanotypes using
photofopier negs - I use inkjets myself.
I picked up the lamp second hand - it had been hauled out of dismantled
supermarket. You can quite often get these. The self-ballasted ones are
the ones to get, and make sure they are properly earthed - some that are
intended to be used up high are not, and can kill ya!

Kate

-----Original Message-----
From: ryberg [mailto:cryberg@comcast.net]
Sent: Wednesday, 13 July 2005 7:56 a.m.
To: alt-photo-process-l@sask.usask.ca
Subject: Re: test images: screw-in BLB UV box--1000 watt bulb?

Joe,
     Thanks. I too worry about the heat with cyanotypes. Your memories
of cyanotypes fit my experience--really long except in sunlight (never
used a plateburner). Sunlight here in Portland is iffy except for a
while in the summer. I think I'll save up for plain BL tubes. Charles.

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