Re: Masking

Matthew Baily wrote:

>
> Hello all,
>
> I have a problem that some of you may know the answer to or recognize.
> When I mask the negative by placing a rubylith window on top of the
> negative between it and the glass of the contact frame I get a fine
> line of exposed emulsion (develops out to be a fine line on all four
> sides of the image) where the edge of the negative is. But, the mask
> window is smaller than the image on the negative and covers the edge
> of the negative. When I place the mask between the neg. and paper the
> problem goes away, but the contact is poor at the edges of the images.
> Do you think light could be travel horizontally through the negative
> and causing an exposure at it's very edges ( a bit like fiber optics)?

Yes. That happens. It's called "piping." It is more common with
polyester substrate based negs. Kodak HIE film (polyester base) is
notorious for that effect. (In fact, that's part of why 35mm HIE gets
loaded in complete darkness.. it will pipe light through the leader
tongue and into the roll)

 
Keith Krebs

"Just some guy," caretaker of the Multiverse's largest EPSON printer
User Community (highly recommended by Vogon Poets and MegaDodo
Publications), at:
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"For the rest of you out there, the secret is to bang the rocks together
guys"

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Received on 06/29/06-02:11:42 PM Z