Arthashastra
ख द्योत चूर्णं सर्षप तैल युक्तं रात्रौ ज्वलति ॥
The powder of khadyota (fire-fly) mixed with the oil of mustard seeds emits light at night.
english translation
kha dyota cUrNaM sarSapa taila yuktaM rAtrau jvalati ॥
hk transliteration by Sanscript