Can one go into the mikvah with a tattoo eyeliner that is not removable once its done?
Thank you for your question.
Going to the mikva is not a problem, since the ink in embedded in the body and is there permanently. There is another issue with using tattoo makeup, and that is that we are not permitted to tattoo our body, as it is considered defiling it.
Please see the following post https://dinonline.org/2018/02/19/permanent-make-up/