Pure kohl is beneficial to the eyes and is not harmful

No File Exists
Check below answers in case you are looking for other related questions:
Treating cracks in the feet with tattoos
Using henna with egg yolks on one's hair

No File Exists
Related Answers:
Ruling on dyeing grey hairs
There is nothing wrong with a woman wearing a white wedding dress
Ruling on reducing the hair of the eyebrows
Treating cracks in the feet with tattoos
Using henna with egg yolks on one's hair

Recommended answers for you:
Wife complaining of husband’s mistreatment
Description of ‘Umrah
Braiding men’s hair
  Do the jinn help humans in some ways?
Engagement according to sharee’ah