[pure-silver] Re: High B+F with DS-10
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 4 Feb 2005 11:49:45 -0800
----- Original Message -----
From: "John Black" <jblack@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, February 04, 2005 9:15 AM
Subject: [pure-silver] Re: High B+F with DS-10
>
>> The color in the film base whether it is acetate or
>> polyester cannot be
> removed.
>
> Bummer. How does the US company (I forget the process
> right know) that will
> take your exposed B&W film of any kind, make acceptable
> transparencies from
> them if you cannot in some way remove or neutralize some
> of the base
> density?
>
>>
>> MACO produces a film with a colorless base. Fomapan R (a
>> reversal film)
> should also be on a colorless base.
>
> I assume this can be obtained in 35mm? Some of the Fuji
> 35mm films are
> almost clear base, i.e. Acros and Neopan 1600, they might
> work. If I wanted
> to do my own reversal processing (B&H has the Kodak kits
> but won't ship
> them, probably because of the dichromate), what would the
> best film be?
> Where could one get lesser quantities of the MP films?
>
> JB
>
The answer to the first question is that they can't
remove the anti-light-piping pigment from the support. Its
not so strong as to ruin the material for projection, it
just makes it a little dimmer. Films intended for reversal,
like Agfa Scala, are coated on clear support. Color film,
and I think also Scala, use an anti-halation layer under the
emulsion rather than on the back of the support. This is
decolorized during processing. Because it is inbetween the
emulsion and support it serves to prevent fogging from
light-piping as well as halation from internal reflection.
I don't know how old reversal movie film was protected,
perhaps it wasn't.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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