From: Manuel Gomes Teixeira (PunctumStudios@netc.pt)
Date: 09/03/01-06:02:09 AM Z
Sandy,
Thanks for your comments.
I thought about this question and I realised that I used outdoors a
different printing frame ( a very old one from my grandfather) than with the
BL tubes. Can this explain the difference? Perhaps this old glass absorbs
more UV light than the modern frame I used with the BL tubes .
I agree with you that something strange is happening here.
The Bl tubes I'm using are the same as you : Sylvania 24" F20W/350BL- 12
units. I'm going to investigate this phenomenon. As I said before I confess
my lack of experience in exposing either silver POP or Pt/Pd prints to
sunlight because my working space does not permit it.
Manuel Gomes Teixeira
> From: Sandy King <sanking@clemson.edu>
> Reply-To: alt-photo-process-l@sask.usask.ca
> Date: Sun, 02 Sep 2001 10:51:57 -0400
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: POP choices
>
> Manuel Gomes Teixeira wrote:
>
>
>>
>> I do not confirm as you said that direct sunlight will be faster than
>> artificial light source. My experience says the opposite. At least with my
>> working conditions.
>>
>
>
> Just want to clarify that my comparison for printing speed of the BL
> tubes with direct sun was based on "real direct sun, no clouds," not
> open shade. You may want to test the light sources again under these
> conditions. At my location in South Carolina in the US I am located
> in terms of latitude a little farther to the south of you (about 1-2
> degrees depending on your exact location in Portugal), but I can't
> imagine this small difference could account for the discrepancy in
> printing speed. However, if it turns out that you really have BL
> tubes that print faster than direct sun I must have some of them. I
> use Sylvania 24" BL tubes, in fairly common use here in the USA among
> alternative printers, and these tubes just do not compare to direct
> sun in speed with any of the processes I have used.
>
>
>
> Sandy King
>
> --
>
This archive was generated by hypermail 2b30 : 10/01/01-01:41:32 PM Z CST