|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.