Richard Sullivan (richsul@earthlink.net)
Fri, 19 Mar 1999 09:25:37 -0700
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
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