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[OM] Re: cleaning negatives

Subject: [OM] Re: cleaning negatives
From: AG Schnozz <agschnozz@xxxxxxxxx>
Date: Wed, 4 Aug 2004 07:19:48 -0700 (PDT)
> > If that doesn't work, the skin oils and bacteria have
> already
> > eaten into the emulsion.

> :-( how long does that take to happen?

In a couple of days some fingerprints will have "set".  It
totally depends on whether or not the emulsion has hardened
prior to the contamination.

By six months, the fingerprints will have permanently etched the
emulsion.  PEC-12 will remove any remaining oils and dirt. 
Sometimes just cleaning the neg with PEC-12 will give you a
clean scan, but sometimes you have to also follow up with
nose-grease which "fills the gaps" and changes the diffraction
angles from any scratches. Nose-grease effectively changes the
surface location of the film.

With old-fashioned enlargement, nose-grease is a miricle
substance and it does work for scanning too.  However, in my
experience, you will end up with more "pepper-grain" noise in
the scan caused by diffraction.  (can you say: Velvia? Provia?)

AG


                
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