Charak Samhita
अयोरजः सकासीसं त्रिफलाकुसुमानि च । करोति लेपः कृष्णत्वं [२] सद्य एव नवत्वचि ॥११५॥
The paste prepared by bhasmas of iron, kasisa and triphala (haritaki,vibhitaki and amalaki) flowers provide blackness in the newly formed skin quickly.
english translation
ayorajaH sakAsIsaM triphalAkusumAni ca । karoti lepaH kRSNatvaM [2] sadya eva navatvaci ॥115॥
hk transliteration by Sanscript