Re: btzs tubes and clearing kodak films

Shannon,

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.

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.

Sandy

>I use BTZS tubes to process 4x5 and 8x10 negatives. The directions
>say to leave it in the hypo for about four times as long as the film
>takes to clear. For me that works out to 8 minutes. Also it says
>to leave it in a double strength solution of hypo clearing agent for
>extra time, but it doesn't say how long. All this is to get rid of
>the anti-halation layer in Kodak films. I have noticed that if I
>don't do this extra fixing and clearing, that sometimes there is a
>faint cyan color to the negatives. I wonder how long other people
>who use these tubes are leaving film in the fixer and then the hypo
>clearing agent, and if you ever have trouble even then getting rid
>of the anti halation layer.
>
>--shannon
Received on Thu Feb 26 14:03:48 2004