[rollei_list] Re: Glafkides photographoc chemisrty
- From: "jayers" <jayers@xxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 2 Jun 2005 20:50:42 -0700
It was published by Fountain Press London in 1958 so I would guess you =
would
need to query English book sellers. The 2 volumes are extraordinary.
Jonathan
-----Original Message-----
From: rollei_list-bounce@xxxxxxxxxxxxx
[mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Thursday, June 02, 2005 11:04 AM
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: was : Agfa Scala, now : home-made B&W slides =
in
120 revisited
----- Original Message -----=20
From: "claude.eichel" <claude.eichel@xxxxxxxxxxx>
To: "rollei_list" <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, June 02, 2005 4:40 AM
Subject: [rollei_list] Re: was : Agfa Scala, now : home-made=20
B&W slides in 120 revisited
> Hello Emmanuel and Richard,
> - The amount of sodium thiosulfate results of the reading=20
> of P. Glakkides book, in my understanding it was a=20
> constant but I can be wrong. An other reason is that I=20
> wanted to find a standard procedure usable by anybody. I=20
> agree with you that some realadjustments can by done=20
> varying this quantity.
> - Fogging is not a problem for the most part of the mark=20
> of films, the only one for wich I did'nt get any good=20
> result is Fuji Acros 100. I'll try to add bromide in PQ.
> - The bleaching choice was done more on toxicity than=20
> efficiency. But permangante woks fine for me.
> - The fixing step is present in the procedure, I'm allways=20
> using a hardening fixer.
> - Thank you for the formulae! The second one (Agfa) its=20
> very interesting for me because it mix a developer and an=20
> hardener : formaldehyde + sodium hydroxide is the base of=20
> an hardener. I'll try it asap.
> I have a question Richard : I'm trying to avoid light=20
> fogging after clearing. I made a test with Semicarbazide=20
> hydrochloride mixed in the second developper(found in=20
> Glafkides) but I did not obtain good results do you have=20
> an idea ?
> Regards
> Claude
>
> Acc=E9dez au courrier =E9lectronique de La Poste :=20
> www.laposte.net ;
> 3615 LAPOSTENET (0,34=80/mn) ; t=E9l : 08 92 68 13 50=20
> (0,34=80/mn)
>
>
I think you are way ahead of me for practical reversal=20
processing. Also, I've been looking for a copy of the=20
english language edition of Glafkides for years now, it=20
seems to be quite rare.
I found recent formulas for reversal processing in one of=20
the Kodak manuals for motion picture processing H2415. This=20
is available on-line from the Kodak site, it is Module 15 of=20
a publication _Processing Kodak Motion Picture Films_ The=20
various sloutions are for machine processing of motion=20
picture stock but might be useful as indicating the=20
approach. The process described still uses a re-exposure to=20
strong light to fog the film. Kodak's color processes seem=20
to use a borain but the chemistry is beyond me. I think the=20
formulas for processing color motion picture film are also=20
on line from Kodak or perhaps the MSDS for the E-6 chemistry=20
would have a hint. I think chemical fogging is used for=20
these processes.
Again, I find it odd that there seems to be so little=20
literature covering reversal processing of B&W film despite=20
its wide use for perhaps 40 years.
I am not a chemist. There is one I can write to and=20
perhaps get a better answer. I will try that.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx=20
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