Arthashastra
श्वेत बस्त मूत्रे सप्त रात्र उषितैः सिद्ध अर्थकैः सिद्धं तैलं कटुक आलाबौ मास अर्ध मास स्थितं चतुष् पद द्वि पदानां विरूप करणम् ॥
The oil prepared from mustard seeds previously kept for seven nights in the urine of a white goat will, when used (externally) after keeping the oil inside a large bitter gourd for a month and a half, alter the colour of both biped and quadruped animals.
english translation
zveta basta mUtre sapta rAtra uSitaiH siddha arthakaiH siddhaM tailaM kaTuka AlAbau mAsa ardha mAsa sthitaM catuS pada dvi padAnAM virUpa karaNam ॥
hk transliteration by Sanscript