Re: btzs tubes and clearing kodak films

Although unattractive, I've been assured by Kodak that
a little purple in their t-max doesn't harm anything
assuming the stain is even. Although given the recent
discussion on UV blockage from t-max, I won't say this
is the case for alt printing having never tested it.

I use Jobo tanks and don't have this problem but the
bottom line in clearing the purple stain from t-max is
fixing. Hypo clear only will remove the remainder of
the stain fixing leaves behind.
Kodak Rapid fixer has a 60 roll capacity per gallon
and if you exceed that, you will get more and more
stain as you continue to use it beyond that capacity.
The film will be fixed enough but the ability to
remove the stain will diminish. The stain will remain
no matter how much hypo clearing u do after using
"t-max exhausted" fixer. FYI, The fixer capacity is
DOUBLE that with non-t-grain emulsions.

Eric Nelson
http://www.eman-photo.com/

> >>There is no magical time because the time it takes
> to clear the
> >>anti-halation coating varies a lot with films. The
> Hungarian films
> >>clear quickly and completely in five minutes in
> the fixer, while
> >>some of the Kodak films, Tmax films in particular,
> won't clear
> >>completely with ten minutes in the fixer and 20
> -30 minute washes.
> >
> >
> >What are the Hungarian films?
>
>
> Forte, Bergger BPF, JandC Classic, maybe Fomopan and
> perhaps Efke.
> The first three for sure are all made at the same
> plant in Hungary,
> or at least I have been lead to believe this is
> true.
>
>
> >
> >>
> >>I always remove the film from the tubes after the
> stop-bath and fix
> >>and wash in trays. Whatever period of time it
> takes to clear the
> >>anti-halation back is the time I use.
> >
> >
> >I take the film out of the tubes after the
> developer, and stop and
> >fix and wash in trays. In two minutes, the film
> clears, but the
> >directions say to leave them in there four times as
> long as it takes
> >to clear the film.
> >
>
>
> There are two issues. One is clearing of the
> emulsion in fixing. We
> normally fix for about two times the clearing time
> and times don't
> vary very much with films. The other issue is
> clearing of the
> anti-halation backing of the base. This varies a lot
> with films, and
> I understood that your original question was about
> this.
>
> Sandy
>
>
>

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Received on Thu Feb 26 15:25:54 2004