Re: Using old dry plates

[Philippe Ayral <payral@club-internet.fr>]

I have a Gevaert Photo "Formules Photographiques" (no publishing date) but
advertising for a new manuel 1943 edition.
They give two formulas for Superchrom studiofilms:
    G. 213 Pyrogallol developer    -    dev. time around 10 minutes 18° C
    G. 214 Metol-Hydroquinone developer fot tank development    1 stock + 1
water     9 mn 18°C or 6 mn 24°C
If you need the complete formula, I will mail an image of the page.
It's written in French.

I hope it will help.

--
Ayral Philippe
52, rue de Vallard
74240 Gaillard
France
Tél/Fax: +33 (0)450 39 79 81
http://www.focale.ch

Richard Knoppow wrote:

> At 05:27 PM 08/21/2001 +0000, you wrote:
> >  Hi,
> >
> >  This weekend I bought in a garage sale an old Kodak Medalist with some
> >accessories and an unoped box of 6 1/2 x 9 Gevaert Superchrom anti-halo
> >plates (tropical version). It looks to be in perfect conditions and I
> >thinking to try then.
> >  Some questions:
> >
> >  - Any idea of time of exposure in a sun day???
> >
> >  - How can I develop it???
> >
> >  Yours,
> >
> >  Charles
> >
>    My Gevaert Manual dated 1964 does not list Superchrom, I suspect its
> much older but have no other reference. You might try looking in editions
> of the_British Journal Almanack_ from the 1950's. The BJA always had a
> pretty complete listing of materials and instructions for processing. Also
> check your library for editions of the _Geveart Manual of Photography_
> older than mine. My older _Photo-Lab-Index_ does not list Geveart. There
> may even be instructions inside the box!
>   From general practice in naming films my guess is that this is an
> orthochromatic material.
>  Its possible to use 120 film in the Medalist by trimming the edges of the
> spools. The lens is outstanding which makes up partly for Kodak's typicaly
> awful ergonomic design.
>   These plates are likely to be pretty foggy. Grant Haist* recommends
> adding 0.2% Benzotriazole, 20ml/liter to 40ml/liter to the developer for
> outdated B&W films.
>
> *_Modern Photographic Processing_ Grant Haist, 1979, Reprinted 2000, Haist
> Press, Okemos, MI
> ----
> Richard Knoppow
> Los Angeles,Ca.
> dickburk@ix.netcom.com