
Originally Posted by
InkExpress
Have you looked at the design artwork to see if there's an issue with it, possibly not a solid spot colour? If the digital image has the colour made up of spotted colour this would be produced by the printer and then transferred to the mug.
The only other thing that jumps to mind would be the paper, check you're printing on the correct side (printing on the wrong side means the paper surface is very fibrous and this can make solid colours look spotted and fuzzy)
Alex