From: Robert W. Schramm (schrammrus@hotmail.com)
Date: 06/05/00-06:24:55 PM Z
Sandy,
Thats the way they come these days. I have one large tank with a SS
lid which is stuck. I havn't seen SS lids for a while.
Bob
>From: Sandy King <sanking@hubcap.clemson.edu>
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: Film tank lids
>Date: Sun, 04 Jun 2000 11:14:28 -0400
>
>Bob,
>
>What purpose do plastic lids on SS film tanks serve? The SS lids on my 35mm
>and roll film tanks appear to work fine and have never needed replacement.
>
>Sandy
>
>
>
>
> >I don't know how many folks on this list use 35 mm SS film tanks
> >with plastic lids but I am guessing that there are quite a few.
> >Therefore, I want to pass along something I learned by painful
>experience.
> >
> >As you know, the plastic lids wear out eventually and you can buy
> >replacement lids. One did and I bought a replacement, put it on the
> >tank and put the tank with the others.
> >
> >Perhaps two or three weeks later I processed a roll of film and
> >there were strange light streaks on it with increasing intensity
> >near one end of the roll.
> >
> >I had never seen anything like this before so I check a lot of
> >things like the cameras, the developer, the darkroom for light leaks
> >etc. etc. This went on and one for a week or so. Everything checked
> >out OK but I was still getting fogging.
> >
> >Finally, I held the plastic tank lid up to the light to check for
> >unseen tiny cracks and the problem was solved. There were no cracks
> >but the black plastic was not opaque. Something went wrong during
> >the maufacturing and the pigment in the plastic was absent in places.
> >In ordinary reflected light the lid looked OK. This could only be
> >seen when it was held up to a 100 watt light bulb. The pigment was
> >more absent near the center of the lid which explained why the fogging
> >was worse near one end of the roll.
> >
> >Since I had bought several lids at the time I check these brand new ones
>out
> >and found another defective one. Since then I have checked
> >all my plastic lids and all the ones at the College and have found
> >some more defective lids.
> >
> >Moral: Before you flip your lid, hold it up to a 100 watt light
> >bulb and check it out.
> >
> >I would be interested in knowing if anyone else has found defective
> >film tank lids.
> >
> >Bob Schramm
> >
> >Check out my web page at:
> >
> > http://www.geocities.com/schrammr1/schramm_studioa.htm
> >
> >also look at:
> >
> > http://www.wlsc.wvnet.edu/www/pubrel/photo.html
> >
> >________________________________________________________________________
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>
>
>
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