Anandakanda 1.23.234

1.23.234

saptāhānte samuddhṛtya yojayettaṃ jarāpaham /
<saptamaḥ prakāraḥ>
kuraṇḍakarasaiḥ sāndramātape mardayedrasam //

At the end of seven days, having extracted it, one should employ it to ward off senescence.
<Seventh method>
One should grind mercury densely in the sunlight with the juices of kuraṇḍaka.