I purchased a Canon package of inks for my Canon TR8500 printer from Amazon. These are genuine Canon inks. All the cartridges are marked 281 and ALL of them work just fine except the blue color. Canon has replaced the cyan blue with one called Ph...
thanks - I think you're right and my printer just won't use that ink. What a waste - I didn't realize I would have to do extensive research to get the correct ink for this printer. My mistake - I will never buy another Canon printer again.