I have recently started printing my own color, and so far it has been nice with few problems. But today I tried printing some of my b&w negs on color paper and I have a "splotch" in the upper left corner of my prints... the chemistry has been the same as with my true color prints, but those don't have a "splotch" in them. Any ideas as to what it could be? I am using the Arista RA-4 kit from Freestyle and developing in a drum on a motor-base. These are both printed on Kodak Supra Endura, the neg with the sunflowers is APX100 in WD2D+ and the train one is APX100 in Rodinal 1:50. Sorry about the poor scans too.