Re: [PPLetterpress] Halting exposure
- Dear Mark
Stay with the goldenrod. Strips of film negative will work as well.
Mark Attwood wrote:
> I have found that UV light seems to partially go through rubylith and give
> semi-exposed areas on the polymer, whereas if I use goldenrod paper it
> doesn't do it. Am I using the wrong rubylith?
I have found that UV light seems to partially go through rubylith and give
semi-exposed areas on the polymer, whereas if I use goldenrod paper it
doesn't do it. Am I using the wrong rubylith?
>From: "Gerald Lange" <bieler@...>
>Subject: [PPLetterpress] Halting exposure
>Date: Thu, Oct 11, 2001, 5:29 am
> This is partially in response to Milton's inquiry.
> If you need to expose one element of the negative longer than another,
> you can mask off the element that needs less exposure with an opaque
> material such as Rubylith. With the vacuum on and the negative-to-
> plate contact secure, register and tape the mask to the vacuum sheet.
> After you have exposed the element that requires the longest exposure,
> remove the mask and re-expose the plate (you can determine the initial
> exposure rate by subtracting the rate of exposure of the shortest
> exposure requirement from that of the longest.)
> It might seem to make more sense to do this the other way around
> (which is what I initially suggested to Milton). But it is a bit
> easier on the nerves to mask this all out before you begin exposing,
> than to try and mask at midpoint.
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