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Author
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Topic: Uneven polyester dye fading
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John Hawkinson
Film God
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Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 09-30-2003 11:11 AM
Continuation from Star Wars topic in the FITA (please don't clutter it with discussion).
I noted that Criterion print #A:0776 of Star Wars: A New Hope (1997 Special edition) on Kodak 2386 polyester had "periodic color shifts toward red, lasting anywhere from a few seconds to a few minutes. Perhaps the result of improper storage and infrequent rotation."
Brad Miller said, "John, the color shifting was on all prints. It was that way on the best of the remaining elements. That wasn't just the copy you screened."
That doesn't quite ring true to me, since I don't at all recall this color shifting problem in 1997 when the prints came out. It really seems like some parts of the print faded to red much more than others. Is my memory just crap?
On the other hand, John P. said, "Uneven dye fading is often indicative of improper storage. For example, film stored near a heat source will have a convolution repeat, where the side of the roll that was hotter fades faster. Or acidic by-products of hydrolysis from excess humidity settle on one side of the storage container, causing localized dye fading."
This occured to me, and I even commented on it. But it doesn't ring true for me. I would expect to see fading/brightening effects every few seconds, but not run OK for mintues at a time, and then shift. At least, if it was stored on 2k reels.
Are you suggesting that perhaps the outer half (rather than the left or right half) might see some kind of localized heat effect? That seems kind of farfetched to me. There was no localized fading in the sense that one side of the image was faded and the other was not. Furthermore, the transitions between fading and non-fading were sharp, sometimes across cuts; they were not slow gradient changes.
Anyone have anything to offer?
--jhawk
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 09-30-2003 03:36 PM
That was quick, you must have read my last post the moment I sent it!
John, I'm sure you'll read this, when CRI was introduced, was it's problem with fading not known, or was it expected, but felt to be outweighed by the advantage of the generation saved?
I assume that in 35mm, all CRI printing must have been optical, to preserve the correct geometry of the negative. I know that CRI was used, contact printed, in 16mm to produce final prints with the standard geometry, base to lamp, for that gauge.
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