From: Katharine Thayer (kthayer@pacifier.com)
Date: 08/19/03-03:12:35 AM Z
Ender100@aol.com wrote:
>
> Katherine,
>
> Do you mean "too much heat" during the exposure?
Sorry, Mark, I didn't see this before. Yes, I meant too much heat during
the exposure. Some lights as you know are hotter than others and serious
overexposure with a hot light source may just "cook" the gum. I've seen
it happen once, when I tried using the sun for exposure and way
overestimated the exposure time for direct exposure to the noonday sun
on a hot black roof. That's the only time I can say I've ever seen gum
actually"insolubilize" under the dense parts of the negative in all the
years and hundreds of gum prints that I've made. But on second thought,
I don't know that it wouldn't have resolved with longer development,
because I didn't give long development a chance with it. I just looked
at it after a usual development time, assumed it was "cooked", tossed
it out, (it was just a small test scrap) made the next exposure a
fraction of the first, which worked perfectly, and went ahead and made
the prints. So I can't be sure that I've seen unwanted insolubilization
even once.
Katharine
>
> Mark Nelson
> In a message dated 8/17/03 10:27:59 PM, kthayer@pacifier.com writes:
>
> My observations are consistent
> with hers, that while the highlights may fog irreversibly
> under a very
> thin negative, an overexposed print made with a reasonable
> negative will
> almost always clear with longer development. If it doesn't,
> I would
> suspect too much heat as a cause of the "insolubilization",
> rather than
> too much light.
> Katharine
This archive was generated by hypermail 2.1.5 : 09/05/03-09:30:46 AM Z CST