Re: Trick for increasing speed of photo papers?

"There are probably better and more repeatable ways to do it."

Exposing the photo material to ammonia vapor might be somewhat less
hazardous.
Nuclear emulsions for astronomy are kept under hydrogen (prior to exposure)
to enhance speed.

Martin

----- Original Message -----
From: "Louis de Stoutz" <loudest@attglobal.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, November 18, 2004 11:30 AM
Subject: Re: Trick for increasing speed of photo papers?

> Loris, just for your information, since I don't think this is a viable
> solution for your purpose:
>
> Some 30 years ago I experimented with exposing B&W paper to mercury
> vapors (in order to use it as a negative in a very old large format
> camera). I noticed a strong increase in sensitivity, but also in
> contrast. I never did systematic research though, and thus couldn't
> quantify the process. What I did was to lock the paper in an airtight
> box together with a "drop" of mercury of about 1cm diameter for 24
> hours. There are probably better and more repeatable ways to do it.
>
> Louis
>
>
> Loris Medici wrote:
> >
> > Is there any trick that can be used to increase the sensivity of B&W
> > photographic paper (by say... 2 or 3 stops for instance)
> >
> > TIA,
> > Loris.
> >
> >
> >
> >
> >
>
Received on Thu Nov 18 05:33:51 2004