From: Randall Webb (randall.webb@lineone.net)
Date: 06/04/00-05:00:41 PM Z
----- Original Message -----
From: Robert W. Schramm <schrammrus@hotmail.com>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Sunday, June 04, 2000 6:34 AM
Subject: Film tank lids
> 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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