From: Sandy King (sanking@hubcap.clemson.edu)
Date: 06/04/00-09:14:28 AM Z
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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