[alt-photo] Re: Dichromated Gelatin Formula

[Gordon J. Holtslander]

On 9/20/2012 2:31 PM, Francesco Fragomeni wrote:
> Hi all,
>
> Does anyone have a formula for mixing a 20% dichromated gelatin using Knox
> 250 Bloom gelatin and Potassium Dichromate? This would be for use in the
> Woodburytype process. Also, if you have experience with this, how thick do
> you recommend the gelatin layer be for the relief?
>
> Thanks,
> Francesco
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>

In Crawford's "Keepers of the Light" he indicates there is a good 
technical summary of Woodburytype in

The Encylopedia of photography, New York 1898, pp 469-470, 522-523

and a couple of others.  I can list these if interested.

Gord

-- 
Gordon J. Holtslander
gjh at shaw.ca