After powder spraying, die-casting hardware will fade when tested with acetone. Why?

The reason may be: 1. The coloring time is too short and the fastness is not good. 2. There is something wrong with the pigment, and it may have a certain weight when it is mixed. 3. The master's skills need to be improved. We have a customer who often encounters this problem, which is the reason of the master. It's no use changing teachers in the future. I hope I can help you!