1. Color masterbatch has not been seriously tested, pigment is too little or too much, 2. Measurement is inaccurate when used, and there are a large number of phenomenon of random measurement by domestic enterprises, especially small and medium-sized enterprises. 3. There is a problem with the matching of masterbatch and resin. This may be Color masterbatch carrier improper choice, but also may be the manufacturer to change the type of resin 4 at random, the temperature of the machine is improper, the masterbatch stays in the machine for too long processing procedures: first check whether the resin type matches the masterbatch, measurement is accurate, and then adjust the machine Temperature or speed, if there are still problems, should contact the masterbatch manufacturer.