RE: bronzing in pt/pd

They are directly related but also with the type or mix of coating being
applied. PD is much more likely to bronze than platinum, but a thin coating
will do it, I have not seen or do not recall seeing, a well coated print do
it. You can also see it if you have an imbalance in the coating solution;
too much ferric for too little metal salts.

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 

> -----Original Message-----
> From: Christina Z. Anderson [mailto:zphoto@montana.net]
> Sent: Thursday, April 06, 2006 9:14 AM
> To: alt-photo-process-l@usask.ca
> Subject: Re: bronzing in pt/pd
>
> So what y'all are saying, Eric, Don, Jeremy, is it is as much exposure as
> thin coating, and the thinness just created more of an exposure issue??
> chris
>
>
> > Chris, If you are having your students coat and print with brush
> strokes
> > that show it will be easier to see some on many prints. It is easily
> done
> > with the use of a brush; foam or bristle. You can feather the edges of
> the
> > overcoated area, that where the neg presumably won't be placed, to allow
> > for
> > some very thin areas. If thin were the only the answer you could see it
> > all
> > over the place where thin coated areas were present. It also has to do
> > with
> > coating solution used. If you are only using PD it will appear more
> often,
> > but can happen with PT as well.
> >
> > Thinner coatings are faster than thick ones but are also less able to
> hold
> > the exposure before bronzing/solarizing (old expression).
> >
> > Eric Neilsen Photography
Received on Thu Apr 6 12:01:51 2006