Anandakanda 1.4.453

1.4.453

punaśca pūrvacūrṇaṃ tu tulyaṃ kṣiptvā dhamet priye /
secayet saptadhā tvevaṃ syādbījaṃ rasarañjakam //

And again, casting an equal amount of the previous powder, one should blow it, O beloved;
one should quench it seven times; thus the seed becomes a coloring agent for mercury.