Questions about the color of phenolic resin after curing

I used to have heard of phenolic resin coloring after curing?

Generally, this color is covered with a little pigmentation.EssenceEssenceWant to ask how much you heated and start melting

Yellow -green is because the resin has impurities. It should be reddish brown normally. It is difficult to color, but it can be very shallow. The purity of the resin is high. The metal ion content is low.The atmosphere curing is conducive to light color, the short curing time and the temperature are contradictory. The lower the temperature, the longer the curing time!

What method do you use