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Re: [AV Media Matters] acetate tape and plasticizer crystals
Contact Digital Vision (http://www.digitalvision.se) and Preferred Video
Products (http://www.pvpburbank.com).
TTFN,
Mark
joe salerno wrote:
>
>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