Re: Blue gels and Pt contrast
Luis Nadeau (nadeaul@nbnet.nb.ca)
Thu, 19 Feb 1998 21:58:43 -0400
At 10:37 AM -0700 98/02/19, Richard Sullivan wrote:
>I just had a conversation with James DuSel who related that he is having
>quite bit of success with using a blue gel when printing palladium to
>increase contrast in the print. he says he gets at least on paper grade
>increase and a decrease in time of maybe one stop or more. The gel is one
>supplied with lights to convert them from tungsten to daylight.
>
>I think we wobbled through this territory a year of so ago but as I recall
>the conversation was in regards to green glass. DuSel also says that blue
>gel has no contrast effect on the Ziatype but does change its color.
>
>Another interseting observation he has made concerns print times and
>contrast. He says he got a Palladio light bank and his time went to 1/4 of
>what they were before but the contrast went way down. We suspect that the
>contrast may in fact be related to the print times and that the blue gel
>just increases the print times which in effect, increase the contrast.
Very strong possibility and certainly true with dichromated systems.
Luis Nadeau
NADEAUL@NBNET.NB.CA
Fredericton, New Brunswick, Canada
http://www3.nbnet.nb.ca/nadeaul/