Chris Waller , May 28, 2003; 05:07 a.m.
I don't know Arista materials but I have used Kodak Ortholith in Champion Novolith. Have you determined the exposure time by the usual method of a test strip? In the case of Ortholith, after immersing the film in the dev and agitating nothing happens for some time. Then suddenly the image starts to form. It develops by infectious development and happens very rapidly. Perhasp you put it in the stop just as the image was forming. I dev for 2.25 minutes. After that stop and fix. In the case of Ortholith the antihalation backing clears in the fix. But perhaps with Arista the antihalation backing dissolves away or clears in the dev.