Originally Posted by Loris Medici
I would like to answer your question fully, but there is a problem: I recently shifted my residence from Germany to Lahore, Pakistan, and I have to admit that parts of my printing stuff is still wating t be taken out from the boxes and ordered. I hope, however, to resume gum printing pretty soon, by which time I will be forced to sort out my stuff, and accordingly be able to tell you the brand name. It is an acrylic varnish from a Dutch company, bought from a German art supplyer (Boesner). I cannot find it on their website, however.
It is acidic, so I used it successfully to varnish cyanotype (gum over cyano, actually).
But would you enlighten me about "iron prints"? Are you referring to cyanotypes or something else, not-blue?