Rasahṛdayatantra (1728 manuscript)

...the mercury should not remain. At that time, one understands that the work is finished. [7]

Now the signs of digested mercury are described

If, from the digested grāsa, the mercury is turned into paste, or if it cooks itself and returns to its state, this is the sign of the rasa being digested. [8]

The sequence for grāsajāraṇā is described: in the dolāyantra, the grāsa is digested gradually according to the fire's intensity. [8] In other scriptures, eight grāsas are mentioned. One should apply fire according to the weight of the mercury.

Regarding the limitation of the measure: one cannot determine the measure of the first grāsa in this scripture. Therefore, just as a journey to the Ganges is long, one should not attempt to digest all at once. [10]

Regarding the form of the rasa when digesting a sixty-fourth part: if the rasa digests one sixty-fourth part, it should be held firmly. When it enters the veins, it takes the form of a drop of milk. [11]

He says: it takes the form of a leech A common metaphor for the appearance of high-quality mercury., it is steady, and the fire should be sixteenth-part. [12] If the rasa does not digest the sixty-fourth part, it should be held firmly so it does not slip through the cloth. When it takes the form of milk, it is known as correctly digested. [12]

Now the signs of mercury digested with mica are described

It makes a crackling sound, moves like a frog, and becomes motionless; these are the signs of mercury digested with abhraka mica. [14] Mercury digested with mica has these signs: it makes a crackling sound due to the contact with fire, it moves like a frog, and then it becomes motionless. This is the sign of the internal potency. [14]

He says: it becomes copper-colored and steady. The scholar should know this as digested with mica. [15]

Now the Kacchapa Yantra (Tortoise Apparatus) is described

Place a broad, firm pot fragment in the middle of a water-filled vessel. Place the rasa in the middle of that. [16] Use a small iron bowl, seal the joints with mud, and surround it with a fire of cow dung cakes and husk. [17]