On 1 Jun 2002 at 11:39, William Robb wrote: > Here are my thoughts on film washing. > It takes about 15 seconds for the emulsion to absorb whatever > solution it is in, and displace whatever solution was already > soaked into it. So, if the film is soaked for twice the solution > absorbtion time, it will definitely have diluted the fixer as > much as it is going to in each wash tank. > If you are exceptionally paranoid, then go a minute per tank. > Now for some math: > I did some testing and discovered that a 135/36 or 120 roll of > film absorbs about 20ml of solution on the reel. A steel tank > holds about 250ml of solution per film. > Your first wash bath of 30 seconds will leave about .08 ml of > fixer behind. Your second 30 second wash will leave about .00032 > ml of fixer behind, and a third wash will leave .00000128 ml of > fixer as residue over the entire film.
But is that what the wash does? I was lead to believe that the length of wash time was determined in order to ensure that all the soluble salts were leached from the gelatin? Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
