Artwork Category :
   Ceramic mug artwork can be divided into two categories : one is spot color design, another are offset full colors process design.

   Spot color--- single colors printing, no gradient. when print on a white ceramic mug. white color desing usually use mug backgrand as white itself , but in the black mug to avoid being absorbed by background color , will add one white color as ground color.

   Offset full colors process design --- artwork have a gradient color patterns , for example, a picture or photo design that full of colors. but ceramic pigments can not show all the colors with CMYK , lack of required color will use match color to fill in , so a full colors artwork sometiome useing more then ten pieces silk screen molds to complate, and decal cost will be higher. link