Loris,
Sorry it took me a while to reply and welcome back. I was out of town for several days and could not get to my notes. I have tried the silane approach last summer and it works great for gelatin and gum. They do adhere very well to the treated glass. The particular silane in question is
aminopropyltriethoxysilane, widely used in industy to bond fiberglass to resins. Here is a website on the product.
http://www.dowcorning.com/applications/search/products/details.aspx?prod=02649659&type=PROD
There is a usefull PDF file that you can download on that page (called Chemical manufacturing) that gives useful tips on treating glass.
If you are interested in prints on glass I would suggest a different approach. Carbon prints on glass. No messy transfers. The trick is back exposure. That hardens the gelatin at the glass surface and the unexposed image on the top can just be washed away. I never had any problems with adhesion of the image on just clean glass, no special treatments. I guess hardened gelatin just sticks to the glass. The advantages of this process are that you can use any pigments of your liking. Transparent organic pigments work well just as well as traditional pigments like carbon.
The only drawback is that for very sharp images you will need a collimated light source, since the emulsion and negative are separated by the thickness of the glass. Sun works very well. You should have plenty of that in Istanbul.
I would be happy to supply more info on emulsion that I used, sensitization, etc if you are interested.
Marek
> Date: Sun, 15 Jun 2008 20:46:09 +0300
> From: mail@loris.medici.name
> Subject: I'm back! Hi to all + Silane?
> To: alt-photo-process-l@usask.ca
>
> Hi to all,
>
> I'm (finally) back home after 6 months of military service.
>
> As you can easily understand, I'm craving for taking photographs and
> making alt prints. My current priority is working with glass; during
> summer, I want to make cyanotypes and gum prints on glass.
>
> Browsing the internet, I came across with compounds with the generic name
> "silane". What I understand is that silane compounds can be used as
> intermediate material, to help alt process emulsions (or gelatin primers)
> adhering to glass.
>
> Is there anyone using silane for such purposes? What is your procedure?
>
> (My plan is to silanize the glass - which is a self-assembly process as I
> understand it - then coat it with hardened gelatine and then put the alt
> process emulsion on top of this sandwitch...)
>
> What are your suggestions?
>
> Thanks in advance,
> Loris.
>
> P.S. I'm very happy for being around again!
>
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