----- Original Message ----- From: "mike wilson" Subject: Re: Recommendations: Roll Film Washer
> Hi, > > William Robb wrote: > > > For the sake of discussion, I am going to presume that all the > > retained solution is in the film, ignoring that some of the retained > > solution is actually on the reel and tank walls. I will also round my > > figures off where it suits me. > > I calculated somew time ago that a 36 exposure roll of film on the > > reel when saturated held some 30ml of solution. > > That seems like a very high figure to me. As a very rough calculation, > I make the total volume of a film to be (100x2.6x0.05)=13cc. It is > probably thinner than 0.05cm (1/2 a millimetre) but definitely no thicker. > > Do you mean the volume encompassed by the spiral of the film? It may be a high figure. I measured the amount of pre rinse going in (dry film), and then measured how much poured off. I was quite amazed, actually by how much solution stayed behind. I expect that if you pulled the film off the reels, captured all the stray fluid in the tank and reels and squeegeed the excess fluid off the film, the volume would be just a few ml. But, thats not how it works when processing a film. William Robb
