Looking for some help with a color issue that I have not seen before. We have a product that is molded from KingFa PA6-60GF. We have 6 colors for this part. I am having an issue with Yellow and Pink parts. After the parts are molded the color will change over time (8 hrs or more) to either a darker shade or lighter shade (usually lighter). I have done tests with the melt at the low spec of 250c to the high spec of 280c. The lower melt shows some improvement, but the color shift is still present. Currently waiting for the Master Batch supplier to send their Tech support for help. Looking for suggestions in the mean time....