Why have my Pantone colours not printed correctly? Marketing Team Updated July 19, 2018 23:32 Follow When spot colours are converted to CMYK for full colour litho-printing, there will be a colour shift. Please always use CMYK (process) colours in a full colour print job. Related articles Why is my print fuzzy? Why doesn’t the colour on my printed job match the proof I printed on my own printer? Why isn’t the black on my print as black as I thought it would be? Overprint Colours Comments 0 comments Article is closed for comments.