i just wanted to bump that thread to thank you all, especially katharine and her webpage, for your help.
after a long hiatus i took up gum printing again and after some time i a, getting pretty good results.
i love this process. while being a little bored with classic silver photography (and also not having an enlarger right now),exploring the sheer endless possibilities of variarion in gum printing was a real delight.
thanks a lot.