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 Originally Posted by Marco B  I still think it might be some other chemical or additive included that may cause the color.... Yes, It is certainly some other chemical because it is not KBr! 
It is entirely possible that the small bottle being added is a rhodium solution as PE suggested, and that the other red liquid (galon jugs) is a dye; There is perhaps a slight difference in appearence - on the other hand, they could be the same as there are red and green solutions, in both sizes, in the prep room.
I don't know about the small bottle, but I suspect the gallon jugs are filled with dyes.
Anyway, I will get back to the translation corrections which are nearly finished.
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Originally Posted by Fleath It was my understanding that the backing paper is indeed thinner (thicker? It's midnight here) at the edges, even fractionally, to improve light tightness. This is part of what makes it such a specialist thing to manufacture, and such a big part of the cost of 120 format. I'll wait for someone more knowledgeable to pitch in, but a "bevel" at the edges isn't unheard of. Even if only 50 years ago. Interesting.
I have a very very vague image of playing with ("marveling" at) such a thing as a child, but this could just be "creative imaging" 
I have a roll of TMY here... and it is not (to touch anyway) thinner nor thicker near the flanges...
also, remember if this runs the length of the film, it would be thicker and we might all be familiar with such thing.
I notice on my TMY that it still uses those black stripes along the length of the yellow backing paper... not that they seem the least bit bevelled.
Ray
Last edited by Ray Rogers; 02-08-2009 at 10:30 AM.
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Originally Posted by Marco B John Shriver said:
"Interesting that the spooling machine is spooling either 620 or 616 size film. I suppose it would be easy to tell from the pattern of frame numbering." Yes, I was wondering about this... I have used 620 but don't recall anything about it other than that it looked pretty much like 120... Is it possible 620 or 616 is different (in a "bevel" sort of way) from the 120 I am familiar with today?
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Maybe someone with a caliper and some 120 sitting about can actually measure the paper and solve this...
Kirk
For up from the ashes, up from the ashes, grow the roses of success!
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The 120 paper is slightly oversized for the spools. It is necessary to maintain the light tightness of the roll.
I can imagine a bevel to allow the paper to flex and still not let the roll become too thick at the edges. IDK for sure.
PE
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I revisited the documentary and it froze about 1/2 way through, but I saw enough to convince me of some things.
First, I noted the kettle size where they were making the emulsion. Heh. It is too small and does not appear to be jacketed for tempering. The very old picture I posted earlier here is clearly jacketed for heating and cooling. So, that does not appear to be anything but a mixing kettle for chemicals to be delivered elsewhere. Yet they appear to be making.
The coating operation itself is moving at about 10 feet per minute or thereabouts, but that would never pass in production which generally used about 100 ft/min even in those older times. Otherwise, Kodak could not have made much film for a WW supplier. In the early part of the century, those trough coaters certainly did go that slow, but Kodak was a lot smaller then.
I am fully convinced that this was staged with everything dummied up. Probably they were testing equipment out. If you saw how fast film came off the packing line in the mid 60s, and compared it with that film, there is just no comparison. The pictures of a small coating machine posted here on APUG show a small machine with an extrusion hopper that could coat as fast or faster than what is shown in the film.
Yeah, I think it was dummied up to test things. However, the trough coater is full width. I am going to try and watch it again, as that is just where it froze on me.
PE
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If I were director of a documentary, I would probably want the liquids to be colored too, just as movie chemists always have lots of bubbling, brightly colored solutions around. The actual reality of what most solutions look like is pretty dull.
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Originally Posted by Photo Engineer Who knows at this late date?
PE Haunting words. Is there anything that can be done to daylight and untangle the history of industrial photography? Are there any plans at Kodak to publish the secrets that are no longer important to their bottom line? I've never been to Rochester. Perhaps something of this nature is already going on (?).
Originally Posted by Marco B John Shriver said:
"Interesting that the spooling machine is spooling either 620 or 616 size film. I suppose it would be easy to tell from the pattern of frame numbering."
Ray, maybe we should solve this by sticking to the original suggestions of the sides of the film being beveled, and as you, Denise and PE suggested, add a list of remarks about confusing / conflicting aspects in the film
That list might include:
- Film type being made / spooled
- Sides or end of paper backing being beveled
- KBr not being a red solution
- Type of machinery outdated for late '50s
When Denise is going to host this on her website, these remarks might be added on the webpage as clarification / cautionary warnings. Absolutely.
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Denise;
IDK what Kodak plans, but there are plans, of that we can be sure. They may just have a big bonfire of all data in the parking lot at KRL.
PE
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Ron - didn't you mention a while ago that Kodak was going to publish all old formulas at so many years after the fact, and do this a couple times to cover the middle decades of the last century?
Kirk
For up from the ashes, up from the ashes, grow the roses of success!
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