Without having to apply a varnish, the best way is to use frog juice which is a spray which come as both matt or gloss and gives the same eefects as a varnish but isnt noticable with the matt. This reduces the solid black areas from smudging.
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First off, if you touched the metal contacts on the printer or cartridge, you could damage or leave a film on the contact surface. Take it out of the printer, with a qtip dip in rubbing alcohol, squeeze out access, rub surfaces, air dry, and reinsert again. If still no ink, turn the print end up under the very hot water tap and run for 2 minutes. Dry and replace. It may do the trick.
It's likely that the foam pads that the print head rests on when the printer is not in use are saturated with ink. They're to the right as you look into the printer: a rectangular one for black ink and a square one for the colored ink. If you power the printer off and back on, with the cover open, you'll see where the printhead goes to rest.
The pads aren't easy to get at, but you can blot them with a paper towel. Gummy, half-dried ink dissolves in rubbing alcohol, and you can soak a paper towel or a cotton ball with alcohol and wipe down the area. I've had good luck soaking the pads with alcohol, then blotting them dry with a rag.
Okay, this was the problem I posted a few days ago. It's fixed now, so in case you have the same problem with smearing, here's what the help desk from Canon suggested: Open the cover and remove the ink cartridges. There is a gray lever in front of the cartridges. Lift this lever and the printhead can be easily removed.
Our printhead had a buildup of black ink on the surface. I carefully removed this with rubbing alcohol. I let the printhead dry and replaced everything. No more smearing. Imagine a help-desk that actually helped!
you may try
1) clean the cartridge nozzles with dry soft paper
2) clean the cartridge carriage down side surface there might be bled ink.
3) check the cartridge up side there is the lable cover the ink refill hole is ok, no any lable stick there you need put stick lable there.
Take it out and rub the ink outlet on the cartridge with a piece of tissue to clear any residual dry ink. You should eventually see two lines of ink on the tissue, yellow and black. If not then it has dried inside and there is not much you can do except replace it