From: Judy Seigel (jseigel@panix.com)
Date: 06/11/03-03:36:20 PM Z
On Tue, 10 Jun 2003, Craig Zammiello wrote:
> As for Mylar blocking UV light, I'm sure it blocks a part of the spectrum,
> but I don't think it affects most of the process that we all use. I have
> been using Mylar as direct working material in both Photogravure (which
> favors the low band spectrum, being a dichromate based process) and photo
> Litho plates (which favor the high band spectrum, being a diazo based
> process. So, the frequency of UV blocked would probably not apply to most
> Alt. Processes.
> I do have UV filter material that does indeed block UV, and believe me,
> Mylar is nowhere near this material.
> Cheers, Craig Z
>
Whether it's Mylar or shymlar, and does it because it's purely ornery or
has something added, I promise that the Epson inkjet backlight film blocks
UV, because in an hour it wouldn't/ couldn't print the cyano that other
material printed in 5 minutes.
There's also one of the camera films, possibly Ilford, or maybe Agfa (I
forget which, but it starts with a vowel -- has two half moons for notch
code) that similarly blocks light. I confirmed for another printer that an
hour exposure didn't give the tone that other neg film gave in 8 minutes.
J.
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