Color changes sometimes occur due to improper adjustment of the dryer. When printing paper or cardboard, if the drying temperature is adjusted too high, the white is generally yellow. The glass and ceramic industries are the most troubled by the color change during drying or baking. The pigment used here has to be completely changed from the printed color to the sintered color. These sintered colors are affected not only by the baking temperature but also by the reduction of air quality in the oxidation or baking zone.

The above are just a few of the many causes of color change, and one of the areas that makes screen printing so interesting and challenging. All of this comes down to a point of good process control.

Source: Screen Printing