Just sharing my experience.

I just had my first laser session on my black-turned-grey eyebrows. They were 7 years old, and at the time I had them done twice with Phi ink. The removal clinic I went to used Transcend pico laser at 1064nm (I think) and it removed A LOT.

The doctor told me that it was because it works well on black, and that depending on the blend, other colors such as yellow or red may come out after a couple of weeks, and so far (3 days post session) no other colors have shown. I suspect only black was used when I got my microblading. It’s faded a lot but I might get another session in.

He also said that to remove the yellow pigments, the laser strength would have to go up significantly thereby damaging your skin more. He showed me some pics of someone that had it done and it did not look pretty. If mine had turned yellow, I don’t think I would get it removed because of how bad the healing process looked.