Jonathan,
My exposures for develop-out palladium exposed with a light box similar
to yours vary greatly depending on film stock and development. TXT (by
far my favorite but difficult to obtain in larger sizes) runs about the
times you mention, seldom quite as short as 2 minutes but usually in the
3-5 range. HP5+ and BPF200 have much heavier base fog density and times
run more like 6-10 minutes. TXT in pyro developers runs more in the 10
to 20 minute range, while those other films in pyro take 15 minutes and
up. My climate is similar to yours since I'm less than a hundred miles
away, but I think it's the density of the negatives that accounts for
widely differing exposure times people report.---Carl
Jonathan Hall wrote:
>
> I use 1/4 inch plate glass and get an average of 2 to 6 minute exposures
> with palladium paper made with good old standard Bostick & Sullivan
> chemistry. The paper is Cranes Platinotype.
>
> I use 40 watt BL bulbs from Sylavania.
>
> Curious if anyone else uses these bulbs and what there printing times are as
> it seems people are having longer exposures than I. Could it be the climate
> I live in that allows such short exposure times. I can not see how that is
> possible but have found all kinds of invisible variables throught the last
> eleven years.
>
> Sincerely,
> Jonathan
This archive was generated by hypermail 2b29 : Tue Jan 11 2000 - 12:10:47