Re: I'm back! Hi to all + Silane?
Welcome back! In my understanding, Martin first introduced silane to this group and he probably has lots of info to share with you. If your goal is to achieve good adhesion on glass, I suggest trimellitiated gelatin, or at least phthalated gelatin, mixed with regular gelatin. As a substrate for cyanotype, acid treated pigskin gelatin of high molecular weight is probably best (if avg MW is not indicated, go for very high bloom strength), as this type of gelatin has very strong wet membrane strength. Acid treated pigskin gelatin can be readily trimellitiated or phthalated. By mixing about 1/4 to 1/2 of either of these modified gelatin, adhesion of gelatin to glass is greatly improved. You don't want to use 100% modified gelatin because organic hardeners like glutaraldehyde cannot crosslink 100% modified gelatin at all. If you have a choice, trimellitiated version offers better adhesion even at a smaller proportion. Trimellitic anhydride is also easier to use, although it probably has higher risk of triggering asthma. (Be careful- don't inhale the dust!) See this page for more details: http://silvergrain.org/wiki/Acylated_gelatin If you are using trimellitic anhydride, you can add it in dry form, without first dissolving in acetone. Silane modifies glass surface rather than gelatin, and most likely can be combined with this modified gelatin technique with advantage. -- Ryuji Suzuki "The truth that I am seeking is in your missing file." (Bob Dylan, Something's Burning Baby, 1985) From: Loris Medici <mail@loris.medici.name> Subject: I'm back! Hi to all + Silane? Date: Sun, 15 Jun 2008 20:46:09 +0300 (EEST) > 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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