I know this sounds goofy, but...... I'm making some prints, and one of the negs has a Macbeth color checker in it. The light grays on the color checker are slightly Cyan on the print. To correct, I need to subtract 5 or 10 units of Magenta, but..... I CAN'T!!! My filter pack is 0 Magenta and 50 Yellow!! Fuji Crystal Archive Type C glossy paper Tetenal RA-4 room temperature chemistry. Now what???