Maybe I'm lucky but I've nothing but success w/Spotone dyes. Maybe I've found the right color mix. But even when I point out fairly large areas I've spotted like 4 mm X 4 mm people still don't notice. For Ilford MG IV fiber paper slightly toned in Kodak Selenium I use 9 drops of the neutral black to 1 drop of the blue black. I then let it totally dry in a small artist palette and with a slightly wet brush (depending on how dark I want to go) gradually build up the density as I draw from the dried dye.