Ash-Shama'il Al-Muhammadiyah, Book 7, Hadith 51 (English)

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"'

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ‏:‏ حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، عَنْ عَبْدِ اللهِ بْنِ عُثْمَانَ بْنِ خُثَيْمٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ‏:‏ قَالَ رَسُولُ اللهِ صلى الله عليه وسلم‏:‏ إِنَّ خَيْرَ أَكْحَالِكُمُ الإِثْمِدُ، يَجْلُو الْبَصَرَ، وَيُنْبِتُ الشَّعْرَ‏.‏

also referenced under: Book 7, Hadith 52 (In-Book)