Re: handmade emulsion

From: ben d (email suppressed)
Date: Sat Feb 03 2007 - 01:49:10 PST

Jason et al.

i agree with you about the fragility of the emulsion without a binding
agent. Currently beginning experiments using chrome alum (KCr(SO4)2.12H2O)
as a binding agent for producing a low speed camera stock. i'll update folks
in the next couple of months as to how the camera trials have gone.

ben donoghue

"It is a society, and not a technique, which has made the cinema like this.
It could have been historical examinations, theory, essay, memoirs. It could
have been the film I am making at this moment." -Guy Debord

>From: Jason Halprin <email suppressed>
>Reply-To: Experimental Film Discussion List <email suppressed>
>To: email suppressed
>Subject: Re: handmade emulsion
>Date: Thu, 1 Feb 2007 15:48:52 -0800
>Joe et al.
>Unfortunatley, trying to make a silver halide emulsion without gelatin
>creates some problems (though it may technically be possible).
>Impurities in the silver halide matrix are important to latent image
>formation, and gelatin provides some helpful sulfer ions. If you check
>out the wikepedia article on "silver bromide" it goes into the chemical
>reasons that a defect in the crystal is helpful to image formation. I
>don't mean to deter you from experimenting with agar or other
>coagulates, please do and let us know about results, successful or
>In terms of books on handmade emulsion, "Silver Gelatin" by Martin Reed
>and Sarah Jones is a good one to check out. It addresses still
>photography and applying emulsion to surfaces other than paper, but
>also contains a number of recipies for making emulsion.
>A hint here would be that if you are trying to apply emulsion to 16mm
>film, purchasing print stock and then fixing it completely will remove
>the silver halide and leave a layer of gelatin. When you apply
>emulsion it will bond to the gelatin better than it would to just a
>base. In my trials with this method I have never been able to produce
>something that would be usable as a camera stock: it is much too
>fragile. If anyone out there knows of an application or drying
>technique that helps, please post it.
>-Jason Halprin
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