Normally grain averse Chuck finds this portrait very appealing despite
(or because of?) the grain.
I was also going to guess Ferrania as the source but I have no idea
where I picked that out of my brain. I just recall Ferrania as the
manufacturer of multiple private label films. I had no idea that it was
a subsidiary of 3M.
Chuck Norcutt
On 5/22/2013 11:58 AM, Piers Hemy wrote:
> Tina
>
> It is almost certainly a Ferrania-made reversal film marketed by its parent,
> Minnesota Mining & Mfg, otherwise known as 3M. Most likely it was branded 3M
> ColorSlide, and dates to before 1986. I like the graininess! I like the
> image anyway, but still.
>
> The following extract from the footnotes to the Wihelm Institute report on
> longevity of transparencies has some detail - the full report is at :
> http://www.wilhelm-research.com/pdf/HW_Book_06_of_20_HiRes_v1b.pdf
> ===================
> Only 3M ScotchChrome 100 film was included in these tests; however, 3M
> ScotchChrome 400 and 800/3200 films probably have similar projector-fading
> stability. 3M ScotchChrome films formerly were called 3M Scotch Color Slide
> films; prior to that they were sold under the 3M ColorSlide name. In 1986
> the name was changed to Scotch and the film packaging redesigned in an
> attempt to build stronger identification with the well-known 3M "Scotch"
> brand (e.g., Scotch tapes). The data given here are for the "improved type"
> films introduced in 1988.
> (At the time this book went to press in 1992, ScotchChrome 640T and 1000
> films were still being sold. These films have projector-fading
> characteristics that are generally similar to the improved 1988 films;
> however, the 640T and 1000 films have inferior dark fading stability
> compared with the new films.) Polaroid Presentation Chrome film is a
> non-instant E-6 film made for Polaroid by 3M; Presentation Chrome is
> apparently identical to ScotchChrome 100 Film. Although labeled "Made in
> USA," 3M ScotchChrome and 3M Scotch Color Print films in reality are made in
> Ferrania, Italy by 3M Italia S.p.A. The films are only packaged in the U.S.
> 3M Italia is a subsidiary of the 3M Company, St. Paul, Minnesota. In spite
> of the relatively good projector-fading stability of 3M ScotchChrome films,
> they have comparatively poor dark fading stability and are not recommended.
> By the end of the 6-hour intermittent projection tests with 3M ScotchChrome
> 640T film, a "greasy" surface residue was observed on parts of the emulsion
> surface. The nature of this undesirable substance has not been identified,
> but it likely is coupler solvent or other emulsion addenda. The residue was
> not apparent on slides projected continuously for 6 hours. The exudation
> seems to be caused by the combined effects of intermittent projector light
> and projector heat.
> ====================
>
> I have happy (?) memories of processing 3M Ferrania CR50 reversal film many
> years ago, and can recommend finding any alternative to manhandling a
> 36-exposure length of wet film against a fluorescent tube for the
> re-exposure, followed by reloading the same wet film in the spiral for
> second develop, bleach fix etc. Yuk.
>
> Piers
>
> -----Original Message-----
> From: Tina Manley [mailto:images@xxxxxxxxxxxxx]
> Sent: 22 May 2013 14:25
> To: MUGers@xxxxxxxxxxxxxxx; Leica Users Group; paw; seephoto; Olympus Camera
> Discussion
> Subject: [OM] IMG: Film ID?
>
> PESO:
>
> Scanning Guatemalan children. This is a high-speed, grainy film that has
> faded. The edge of the film says 3M CS 1000. Google is no help. Any idea
> what film it is?
>
> http://www.pbase.com/image/150330845
>
> Thanks,
>
> Tina
>
> --
> Tina Manley, ASMP
> www.tinamanley.com
> --
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