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Topic: Does ester count as acetate?
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-11-2006 12:30 PM
quote: Stephen Furley
John, I don't know when polyester film was first introduced, but I do know that Fuji Single-8 film, and some makes of Super-8, but not Kodak, were on polyester base in the mid-late '60s. Why did it take so long to become accepted for use in 35mm release prints?
Kodak has been making polyester base for almost fifty years (originally licensed from DuPont Chemicals), mainly for special venue films, smaller print formats, graphic arts and x-ray films.
But for 35mm release prints, Kodak wisely invested in improving some of the characteristics like projector dusting and static, that took over $200 Million in R&D and capital improvements about ten years ago. We also encouraged the development of proper tension-sensing failsafes by equipment manufacturers to properly deal with polyester's much higher tensile strength.
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John Hawkinson
Film God
Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 05-11-2006 05:03 PM
Not exactly the most definitive methods, Richard. It's like saying, "I know it when I see it." Fine if you already know, but not-so-fine if you don't.
For modern filmstock from Kodak or Fuji, look for the magenta edgecode in the SDDS area outside the perforations. If it's Kodak, then the first number will in all likelyhood be "2383" or "2393", indicating Kodak Color Vision ESTAR-base, or Kodak Color Vision Premiere ESTAR-base, respectively. (In fact, anything starting with "23" is a 35mm ESTAR-base. "53" is 35mm acetate.)
--jhawk
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 05-11-2006 09:45 PM
quote: Frank Angel
But here's a question, we have thousands of upon thousands of reels of recorded audio much of which is on acetate stock. So how come triacetate film is so susceptible to acidosis (VS) whereas not a single 10in reel of any of our acetate audio tapes, at least to my knowledge, has ever gone vinegar? I would imagine they are a different variation of acetate, no? I mean, physically they are very different animals.
The most likely reason is that audio tape is usually stored in cardboard boxes, or other containers that "breathe", so any acid vapors are not trapped. It's also easier for acid vapors to escape from a 1/4 inch thick tape roll than a roll of 35mm film. Film has often been stored in metal cans or metal film cases, with little chance for acid vapors to escape, so the trapped acid accelerates the reaction. Kodak developed Molecular Sieves to adsorb moisture and acids in sealed container storage, greatly slowing the "vinegar syndrome" reaction. When it comes to film storage, "cool, dry, and vented" are the by-words.
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