Rasaprakashasudhakara 6.78

6.78

daradākarṣitaḥ sūto guṇairevaṃvidho bhavet
kuṣmāṇḍakhaṇḍamadhye tu svedito lakucāmbunā
sakṛt saṃjāyate śuddhaḥ sarvakāryeṣu yojayet //

so mercury drawn from cinnabar becomes endowed with such virtues. / Steamed within a piece of ash gourd with lakuca juice / once, it becomes pure; one should employ it in all operations.