Arthashastra
काच व्यवहारिणो महा कारवश् च विंशति कराः ॥
Those that carry on their trade in glass (kâcha); and also artisans of fine workmanship shall pay 20 karas.
english translation
kAca vyavahAriNo mahA kAravaz ca viMzati karAH ॥
hk transliteration by Sanscript