Re: [APML] Re: Japanese astronomical magazine

["Stuart Heggie" <Stuart.J.Heggie@sympatico.ca>]

George, your efforts are really appreciated! I am sure you know that ammonia
is quite dangerous. If you are heating ammonia in the chamber, I am not sure
that it is safe. Have you checked out the chemistry side of the equation
with a chemist/ChemEng?

Stuart
----- Original Message ----- 
From: "George Anderson" <tillerman1@videotron.ca>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, September 26, 2005 11:32 PM
Subject: Re: [APML] Re: Japanese astronomical magazine


> Ummm, there is something other than film?
> Seriously, in my continued search for B&W films for AP work I have been
> reading through the old AAS Bulletins. I found that there were some red
> and infra-red sensitive dyes used in emulsions which did not respond to
> hydrogen hypering. But they did respond to ammonia hypering.
> I did a web search on ammonia hypering and found a recipe which I gave a
> try tonight with some forte-pan 400.
> The results look quite promising since the 1 second exposure shows
> substantially more than any of the hypered tests that I previously ran.
> The 256 second exposure is also an improvement, but still not to the
> extent of being useful. The fogging of the film was quite low so I will
> try again sometime in the next week with a longer time in the ammonia
> and see how it improves.
> If the forte-pan works out I may re-visit some of the Ilford films which
> did not respond to hydrogen hypering.
> Someone has to be moving backwards in technology to make up for the guys
> moving forward, it is the only way to maintain the balance...
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
> Alan Voetsch wrote:
> > BTW, I'd be interested in having a general idea of how many folks still
> > do shoot EXCLUSIVELY with emulsion. Any guesses? I'm one.
> >
> > Alan
> >
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