[rollei_list] Re:[rollei_list] Re: was : Agfa Scala, now : home-made B&W slides in 120 revisited
- From: "claude.eichel" <claude.eichel@xxxxxxxxxxx>
- To: "rollei_list" <rollei_list@xxxxxxxxxxxxx>
- Date: Fri, 3 Jun 2005 05:12:57 +0200
I am not a chemist either. It's funny to make tries and "create" something.
I'll try the Agfa recipe this evenning.
Claude
>
> ----- Original Message -----
> From: "claude.eichel"
> To: "rollei_list"
> Sent: Thursday, June 02, 2005 4:40 AM
> Subject: [rollei_list] Re: was : Agfa Scala, now : home-made
> B&W slides in 120 revisited
>
>
> > Hello Emmanuel and Richard,
> > - The amount of sodium thiosulfate results of the reading
> > of P. Glakkides book, in my understanding it was a
> > constant but I can be wrong. An other reason is that I
> > wanted to find a standard procedure usable by anybody. I
> > agree with you that some realadjustments can by done
> > varying this quantity.
> > - Fogging is not a problem for the most part of the mark
> > of films, the only one for wich I did'nt get any good
> > result is Fuji Acros 100. I'll try to add bromide in PQ.
> > - The bleaching choice was done more on toxicity than
> > efficiency. But permangante woks fine for me.
> > - The fixing step is present in the procedure, I'm allways
> > using a hardening fixer.
> > - Thank you for the formulae! The second one (Agfa) its
> > very interesting for me because it mix a developer and an
> > hardener : formaldehyde + sodium hydroxide is the base of
> > an hardener. I'll try it asap.
> > I have a question Richard : I'm trying to avoid light
> > fogging after clearing. I made a test with Semicarbazide
> > hydrochloride mixed in the second developper(found in
> > Glafkides) but I did not obtain good results do you have
> > an idea ?
> > Regards
> > Claude
> >
> > Accédez au courrier électronique de La Poste :
> > www.laposte.net ;
> > 3615 LAPOSTENET (0,34?/mn) ; tél : 08 92 68 13 50
> > (0,34?/mn)
> >
> >
> I think you are way ahead of me for practical reversal
> processing. Also, I've been looking for a copy of the
> english language edition of Glafkides for years now, it
> seems to be quite rare.
> I found recent formulas for reversal processing in one of
> the Kodak manuals for motion picture processing H2415. This
> is available on-line from the Kodak site, it is Module 15 of
> a publication _Processing Kodak Motion Picture Films_ The
> various sloutions are for machine processing of motion
> picture stock but might be useful as indicating the
> approach. The process described still uses a re-exposure to
> strong light to fog the film. Kodak's color processes seem
> to use a borain but the chemistry is beyond me. I think the
> formulas for processing color motion picture film are also
> on line from Kodak or perhaps the MSDS for the E-6 chemistry
> would have a hint. I think chemical fogging is used for
> these processes.
> Again, I find it odd that there seems to be so little
> literature covering reversal processing of B&W film despite
> its wide use for perhaps 40 years.
> I am not a chemist. There is one I can write to and
> perhaps get a better answer. I will try that.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
> ---
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