The kohl that is sold as a cosmetic material at drugstores and perfume shops today is not made of ithmid and it is harmful rather than useful for the eyes and the skin; so we cannot say the same thing about it. It is only a cosmetic material. If it is harmful to the health, it is makruh (abominable) to use it. If it is not harmful, it depends on the reason why the woman uses it. If she uses it for her husband, it is mustahab (recommended)**
*In fact, kohl is a means of ornament that dates back to previous ages.
Arab women used to apply the kohl kept in bottles called “mikhala” to the eyes of their children.When the widow Arabs mourned their husbands’ death, they gave up adorning themselves; and they started to adorn themselves again when they wanted to show that they wanted to marry.
Applying kohl was an indication of being ready for marriage.
According to a hadith reported by Muslim, Ibn Atiyya said, "We were prohibited from mourning for more than three days except for our husbands; the period of mourning for the husband was four months and ten days. We did not apply kohl, wear perfume or colorful dresses then."
(Muslim, Talaq, 66, 67). Darimi says, according to a hadith, those who perform fasting are asked to apply kohl at night not during the day (Darimi, Sawm, 28), but he adds that he does not think it is objectionable. *
http://www.questionsonislam.com/question/applying-kohl-permissible-islam