hi; i do have some problem with cyanotype on rives bfk paper. Specialist from Canson who saw it said it seems to be something with sizing (rives bfk is sized internally). strange spots/drops appear on it after drying . i have attached example (as i can not add link yet). i still have few sheets of this paper and would like to use it. has anyone ever had such problem with paper? i should add that i did not see issue in vdb, only cyanotype (also, i have mixed new cyanotype chemicals) thanks; p.