Re: [AV Media Matters] acetate tape and plasticizer crystals

[joe salerno <salernoj@swbell.net>]

Is there any affordable software for denoising or descratching films,
similar to what is used for digital resotration of audio recordings?

I may have asked this befroe, sorry if it is redundant. I don't
think Ihave
ever gotten a good answer, which probably means "no"

Joe Salerno
Video Works! Is it working for you?
PO Box 273405 - Houston TX 77277-3405
http://joe.salerno.com
Fax: 603-415-7616
----- Original Message -----
From: <Mick_Newnham@screensound.gov.au>
To: <AV-Media-Matters@topica.com>
Sent: Monday, April 10, 2000 2:26 AM
Subject: RE: [AV Media Matters] acetate tape and plasticizer crystals

>
>
>>From a FILM perspective (I have NOT tried this on audio/mag
>materials), the
>crystalline plasticiser (tri phenyl phosphate, or TPP for film) deposits
>can be removed with a mixture of ethanol and some other "safe" solvent
>("safe" for the film and person).  I have used 3M's HFE-7100 with
>about 2 -
>5% v/v ethanol ("absolute" not 95% or other denatured form.
>Concerns about
>the water content).  The reason for dilution is that ethanol is a
>very good
>solvent for the plasticisers.  Too good in fact, and will rip out the
>plasticiser that still remains in the base unless great care is
>taken.   3M
>also market HFE-71DE which has a small quantity of ethanol in
it and seems
>to work well for this purpose but perhaps not quite as well as
the diluted
>EtOH/ 7100.  Even using this approach the object should not be saturated
>but just lightly swabbed.
>
>Maybe this solution is OK for mag, I'd be interested in others
perspective
>on the suitability, or results.  Especially if the deposit is
not the base
>plasticiser but a binder lubricant.
>
>Secondly, if the base has begun to decompose (a reaction initially
>co-dependent upon water) is it a fair assumption the binder also
>hydrolysing?  How rapidly does the binder change in viscosity/Tg?  Has
>anyone looked at changes in the morphology or mobility of the
oxide in the
>binder of decomposing mag materials and the effect this might
have on the
>signal?  (Sorry for hijacking the topic but I am researching any similar
>events in silver/gelatin photography and am just curious)
>
>
>Mick Newnham
>Engineering and Research Group
>Preservation and Technical Services
>ScreenSound Australia