Al-Kāfi - Volume 6 > Al-Kohl (The Eye Powder): Antimony
Hadith #6

عَنْهُ عَنْ أَبِيهِ عَنْ خَلَفِ بْنِ حَمَّادٍ عَمَّنْ ذَكَرَهُ عَنْ أَبِي عَبْدِ اللَّهِ ( عليه السلام ) قَالَ الْكُحْلُ يُنْبِتُ الشَّعْرَ وَ يُحِدُّ الْبَصَرَ وَ يُعِينُ عَلَى طُولِ السُّجُودِ .

6. It is narrated from the narrator of the previous Hadith from his father from Khalaf ibn Hammad from those whom he has mentioned who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘Applying eye powder grows hairs, sharpens eyesight and helps to perform longer Sujud (prostrations).”’