Hello Claude: Very interesting the work about B&W slides processing, I have some questions: 1)You used a Jobo machine for the process, I'd like try it manually (if I decide to try the process really); can I agitate the first developer like during a "normal" process?.- 2)Can I use a Rodinal or Rodinal Special developer + sodium thiosulfate as first developer? 3)I never used sulphuric acid, I don't like it, of course; is there no problem to measure and to handle it using plastic elements?. 4)I guess I could use a different fixer (not Tetenal),is it right?. It is necessary the harder really?.- 5)I did not understand very well the way to expose both film faces to a strong light; if the film is in the reel, you can expose to the light one face only. 6)Is it possible to use a commercial bleaching product like Farm (I think for E6 process). Thank you very much in advance. All the best Carlos --- "claude.eichel" <claude.eichel@xxxxxxxxxxx> escribió: > Thank you for the precisions Richard. The times you > indicates are quite similar to those given by > Glafkides (4 to 5 minutes) so I'll begin with 5min. > I allways fix the films (roll or sheet films) after > the second developer. I read somewhere it was an > option but I did'nt trust this. > Claude Eichel > Strasbourg France > > > > > > > ----- Original Message ----- > > From: "claude.eichel" > > To: "rollei_list" > > Sent: Thursday, June 02, 2005 8:12 PM > > Subject: [rollei_list] Re:[rollei_list] Re: was : > Agfa > > Scala, now : home-made B&W slides in 120 revisited > > > > > > >I am not a chemist either. It's funny to make > tries and > > >"create" something. > > > I'll try the Agfa recipe this evenning. > > > Claude > > > > > I just did a comparison of the c.1940 Agfa formula > with > > the current Kodak formula. There is less > difference than > > you would suppose. > > Now, there is a big difference between the > recommended > > development times for the two. The Agfa > instructions do not > > give a definite time but say between 4 and 6 > minutes at 68F > > (20C) for "current films", meaning c.1940. The > somewhat > > milder Gevaert developer gives times for a few > Gevaert and > > DuPont stocks of the time running between 6 to 8 > minutes. > > Now, Kodak indicates the development time should > be about 2 > > minutes at 68F. This is for machine processing > with > > continuous agitation. > > I note that neither the old instructions or > Kodak's > > current one uses a stop bath. In fact Kodak > cautions against > > using a stop bath. A wash step is used, for the > machine the > > wash is 30 seconds at 68F. Agfa recommends a 10 > minute > > running water wash between first developer and > bleach. > > Modern films seem to develop quite a bit faster > than those > > of the 1940's. This proabably accounts for part of > the great > > decrease in development time but I also suspect > the Kodak > > developer is more active even though both have > about the > > same amount of hydroxide in them. > > Again, a caution: If you must use light fogging > for > > reversal the film must be fixed after the second > > development. This insures clear highlights and > makes the > > image permanent. Washing shold be done as with > normal B&W > > processing. If a fogging chemical is used, or if > Sodium > > Sulfide is used for second development the final > fixing bath > > is not necessary. > > > > --- > > Richard Knoppow > > Los Angeles, CA, USA > > dickburk@xxxxxxxxxxxxx > > > > --- > > Rollei List > > > > - Post to rollei_list@xxxxxxxxxxxxx > > > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx > with 'subscribe' > > in the subject field OR by logging into > www.freelists.org > > > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx > with > > 'unsubscribe' in the subject field OR by logging > into www.freelists.org > > > > - Online, searchable archives are available at > > //www.freelists.org/archives/rollei_list > > > > Accédez au courrier électronique de La Poste : > www.laposte.net ; > 3615 LAPOSTENET (0,34?/mn) ; tél : 08 92 68 13 50 > (0,34?/mn) > > > > --- > Rollei List > > - Post to rollei_list@xxxxxxxxxxxxx > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx > with 'subscribe' > in the subject field OR by logging into > www.freelists.org > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx > with > 'unsubscribe' in the subject field OR by logging > into www.freelists.org > > - Online, searchable archives are available at > //www.freelists.org/archives/rollei_list > > ___________________________________________________________ 1GB gratis, Antivirus y Antispam Correo Yahoo!, el mejor correo web del mundo http://correo.yahoo.com.ar --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list