Ibn 'Abbaas Radiyallahu 'Anhu says:
"Rasulullah Sallallah 'Alayhi Wasallam has said: 'The best from among all the kuhl used by you is the one made from ithmid. It brightens the eyesight and strengthens the growth of the eye lashes"' (ES)
English reference (ES): Book 7, Hadith 51 (ES)
Arabic reference (ES): Book 7, Hadith 52 (ES)