I am processing 5x7 & 4x5 negs in a JOBO 6shooter style drum. After processing & 3 or 4 basic rinse cycles I add Heico Perma Wash. I mix it at the strength called for on the bottle. Then, still in the drum, I rinse with the Perma Wash for approximately 5 minutes. After that I empty out the perma wash & rinse for at least 10 cycles, 2 minutes minimum each with the film still in the drum. Then take out, photo flo and hang to dry. The question is simple. Does anyone know of any comprehensive testing done with Heico perma wash and rotary processing? I am a bit nervous with the short times recommended and go longer as you can see. But, is it long enough? When rinsing by the soak & change method I go 10 minute soaks & change and do it a minimum of 10 times(after a perma wash treatment). Will the rotary turbulence give me the same archival quality with the shorter times?

-- Dan Smith (shooter@brigham.net), October 08, 1997

Answers

It is believed that the more constant the agitation in any solution, the shorter the time necessary. Your concern should also be with the overall wet time. The longer the negative stays wet the more the emulsion swells. This can have an effect on the "sharpness" of the image. A good rule throughout the process of photography is minimum,minimum,minimum, From exposure through development to washing the negative.

-- jim megargee (mvjim@interport.net), October 12, 1997.