U of S | Mailing List Archive | alt-photo-process-l | Re: cyano on gessoed Al

Re: cyano on gessoed Al

Rajul, thanks for the update. I'm very interested in the agar-agar stuff
-> seems to be useful for other things too (sizing paper - from Alberto
Novo - and non-toxic carbon - from Halvor Bjoengaard)...

I currently wait for Henk coming back from his trip -> will continue
trying with "beer coating" after hearing back from him.


9 Nisan 2009, Perşembe, 10:53 pm tarihinde, Rajul yazmış:
> To all Al friends,
> This is a preliminary observation but I have been able to do cyano on
> gessoed Al sheets.
> I added finely sieved Aluminum oxide (Al2O3) to the diluted gesso,
> and applied multiple coats of it
> to achieve the desired opacity. Al2O3 killed the super white of the
> gesso, provided tooth, and did not increase the pH. After drying and
> lightly sanding coated sheets, I applied 1% agar, and dried them
> overnight. I still have to improve on the smoothness of the agar coat
> and will try 0.5%. As expected, agar provided the porosity that aids
> cyano printing.
> A cyano mix of 1A + 2B required a 30 min exposure and printed all
> details. However, on development in diluted vinegar, only the shadows
> and low mid-tones stayed; all highlights washed out.
> I will size these plates and see what gum passes will do.
> Details of the process  will follow once I am able to confirm my
> observations.
> Rajul