News — film washing

It's not a power washer. Some people mistakenly believe that washing film under running water is like using a power washer on their driveway. It's not. The running water is not blasting away the residual thiosulfate (fixer). The thiosulfate is actually embedded in the emulsion and can only be removed by diffusion (or dispersion, we'll let the chemists argue over the difference). While the chemistry behind this gets really complex really quickly, the concept is simple. It's more like soaking a dirty pan in the sink to remove the baked-on grease. Basically, the universe likes things in equilibrium. Thus the concentration...