Hey Tom,
Polaroid negs do respond well to selenium intensification but they still
seldom approach the density range of 1.4 necessary for quality, full scale
platinums. Prints can be made from lower contast negs, but the extra chlorate
needed in the mixture to boost contrast almost always causes grainy results.
Low key prints on the other hand would be fine with polaroid negs. Also, I
think the ziatype palladium process is less likely to grain at higher
contrast mixtures than traditional platinum/palladium...check on the bostick
and sullivan website for info - http://www.bostick-sullivan.com
Mike
In a message dated 11/20/02 1:54:38 AM, tomf2468@pipeline.com writes:
<< It is possible to "post process" the polaroid negs with selenium to
increase the contrast. I haven't done this with Polaroid negs, but my
instructions for conventional negs are here:
http://www.pipeline.com/~tomf2468/downloadsalt.html and I have reports
from readers that it works well with type 55 roid. Hope that helps
On Tuesday, November 19, 2002, at 02:49 PM, NeuhausPhoto@aol.com wrote:
> Types 665 and 55 both produce fine negatives but typically neither
> produces
> enough contrast for platinum. --------------
Tom Ferguson >>
Received on Wed Nov 20 18:51:54 2002
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