While designing your artwork, keep in mind the following.
Designing the text, which must be printed black, try to stay away from using all 4 CMYK colours.
Using all colours can result to problems with fonts when printed.
When a printing sheet goes through the 4 towers each containing one of the CMYK colours the sheet may go slightly off which may cause, e.g. yellow edging around black letters.
These are very rare cases; however, we had approximately 1% of orders printed with edging when four CMYK colour values were used.
To avoid this possible problem, you can change the CMYK values to Cyan: 0% Magenta: 0% Yellow: 0% Key (black):100%.
This way the black printing tower and not all four colours will print the text.