Canon MG5100 series On-Screen Manual page 120

Note
Depending on the type of paper, ink may blur if you trace the printed area with a highlight pen or
paint-stick, or bleed if water or sweat comes in contact with the printed area.
Colors are uneven, and print results are blurred.
Tip!: Print the nozzle check pattern to check if the nozzles are
clogged.
If the print head nozzles are clogged, colors may become uneven or the print results may be blurred.
In this case
Print the nozzle check pattern
Check the printed check pattern to see if the nozzles are clogged.
See When Printing Becomes Faint or Colors Are Incorrect .
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