Joao Ribeiro (jribeiro@greco.com.br)
Fri, 19 Mar 1999 21:51:43 -0300
Hi Richard,
Interesting explanation, I noticed that when I coat with less solution
solarization increased, so I started marking in the back of the paper the
amount used for that sheet but I didn't figured out why it happened.
The funny thing is that I am trying to get more of what they are trying to
avoid.
Joao
Richard Sullivan wrote:
> Most solarization and bronzing in colloidal silver prints like Kallitype
> and Van Dyke is caused by coating too thin, too much on the surface,A while
> back or too little metal in the emulsion. Carlos Gasperinho was working on
> improving the Kallitype process. One of his ideas was to overload the
> silver nitrate way beyond what most formulas call for. He said this cuts
> down on solarization and bleach back during fixation. In a three way
> conversation with myself, Carlos and Mike Ware, Ware said it sounded quite
> reasonable.
>
> --Dick Sullivan
>
> At 03:16 AM 3/19/99 -0300, you wrote:
> >Hi,
> >Today one of my students was printing a Kallitype and developing in
> >Rochelle salts. The image turned negative when immersed in the developer.
> >I thought it could be a shift in polarization. When taken out of the
> >developer the image was still negative. Putting it in the EDTA clearing
> >bath didn't revert the situation. Only after fixing the image became
> >positive. The safe light was a 15W tungsten bulb about three feet from de
> >developer tray. Looking in my X-Files, I found no info.
> >Jacques
>
> 505-474-0890 FAX 505-474-2857
> <http://www.bostick-sullivan.com>http://www.bostick-sullivan.com
> http://www.workingpictures.com
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