Re: Hand collotype in process

[phritz-phantom@web.de]

(answering my own question...)
no, one could not, because dried gelatin will pop right off the galvanized steel.
so, adherence of the dry emulsion is a criterium limiting the choice of support. 



> -----Ursprüngliche Nachricht-----
> Von: <phritz-phantom@web.de>
> Gesendet: 18.06.09 04:38:46
> An: alt-photo-process-l@usask.ca
> Betreff: Re: Hand collotype in process


> thanks,
> i just did, but didn't really find anything on coating (i'm operating on high school french too). 
> i found this on the other site: 
> http://perso.numericable.fr/bquantin/web_phototypie/diapo_phototypie/1_preparation_dalle/1_preparation_dalle_fichiers/Slide0007.gif
> it seems they use some kind of support for the emulsion. 
> 
> on the phototypie site, it says that copper once was used instead of glass. but it's not used anymore,  "for various reasons" and "the biggest one being the price". 
> so, if one can use copper instead of glass, one could probably use a cheap sheet of galvanized steel too and use the good old magnetic sign material for a coating frame... 
> 
> 
> 
> 
> 
> > -----Ursprüngliche Nachricht-----
> > Von: "Jack Brubaker" <jack@jackbrubaker.com>
> > Gesendet: 18.06.09 03:34:33
> > An: alt-photo-process-l@usask.ca
> > Betreff: Re: Hand collotype in process
> 
> 
> > On Wed, Jun 17, 2009 at 8:28 PM, <phritz-phantom@web.de> wrote:
> > >  and how do you people coat emulsions on glass plates? freehand with a comb (rather thin coating) or with some kind of frame.
> > 
> > Look at the link Tom posted:  http://www.phototypie.net
> > Even with failed high school French from half a century ago I figured
> > out a lot by going through the long set of photos and discription on
> > the site. My question, is why do they use glass? A less fragile sub
> > would seem a lot less trouble. Is there something about glass that
> > creates a better bond or do they flash it from the back to help bond
> > it? It seems that a metal plate could be grained the same way just as
> > zinc plates are for lithography.
> > 
> > Jack
> > 
> 
> 
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