Anandakanda 1.4.117

1.4.117

ārdrakasya dravairevaṃ saptadhā citrakadravaiḥ /
tatsamaṃ gandhakaṃ dattvā mardayed bhāvayet kramāt //

Thus [one should do] seven times with ginger juice, and with citraka juice. / Adding sulfur equal to it, one should grind and imbue it successively.