I just tried a polyurethane matt varnish and applied 4 coats and then 2 coats of cyanotype emulsion but it still mostly washed off. Is the varnish you use water based or oil based? I will try the gloss next as I think I read somewhere that the matt and semi glass has some type of wax in it.
So far, I am still getting the best results from just gelatine with chrome Alum but this wasn't ideal, too faint but at least there was an image. Would it work to put a gelatine coat over the polyurethane? Also, wondering if it would work better to put the cyanotype emulsion in the gelatine over the polyurethane. Too many possibilities and all time consuming. And I was only working with a 1% chrome Alum mix should this be higher? Has anyone tried any of these and had success?
Last edited by shani; 06-25-2014 at 10:45 PM. Click to view previous post history.