Rasarnava 7.37

7.37

gobhaddo rasakastutthaṃ kṣitikiṭṭo rasodbhavaḥ
kharparo netrarogāriḥ rītikṛttāmrarañjakaḥ //

Gobhadda, rasaka, tuttha, dross of the earth, born of mercury,
kharpara, enemy of eye diseases, producer of brass, colorer of copper;