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According to Rasārņava, Vajramūşā (hard crucible) is made of burnt gāra, husk, white ant- hill soil, cloth, charcoal and rust of iron by mixing them together. Vajramūşā is made by the combination of burnt charcoal 6 parts, black soil 1 part, cloth, burning coal and iron rust. Müşā made of equal portion of husk and cloth, burnt soil- 4 parts and stone at the bed of river (Kūpi-pāşāņa) is called varamūṣā.
There are two kinds of mūşa (crucible), viz. prakāśamūşā and haramūsā (open and closed crucibles). The open crucible is of the shape of lid (Śarāva). There is a lid cover of high head by catching which it can be opened and closed.
Müşā having holes is good for patralepana smearing of leaf, colouring work, uniting joints, sāraṇa, etc.
Bhasamūşā made by the combination of 2 parts of ash of Tilakāştha (sesamum wood) and brick is useful for purification of silver.
Mūsā made of 2 parts of Mocaksāra, brick dust and clay is the best for the purification of silver.
Mūşā made of raktavarga and paripluta and smeared with raktavarga is very good for the purification of all metals (things). In place of raktavarga if Śūklavarga articles are applied for making Mūşā, it will be good for purification of Suklavarga (Silver, etc.)
In Rasasāra it is stated that Vajramūşā is made by the combination of 1 part of iron rust, 2 parts of burnt husk, 3 parts of clay, and a little cotton.
Or vajramūṣā can be made by combining iron-rust, burnt husk, powder of Sipi (Oyster shell ?) and stone lying on river bed of equal portion and clay equal to the same quantity.
A strong Vajramüşā is also made by combining clay of well or kernal of cocoanut and also by mixing glass powder and clay.?
According to the Rasaratna Samuccaya, the other names of Mūsā (crucible) are Kravñcikā, Kumudi, Karahātikā, pācani and Vahnimitra. It removes or destroys (moşana) the defects (impurities) of medicines; for this reason it is called Mūsā. Mūsā is made of clay and iron.3
1. Rasārņava 4/35-45, 2. Rasaņāra 22/8-9. 3. Mūşā hi krauňcikā proktā kumudi karahātikā /
Pācani Vahnimitrā ca rasavādibhiriryate // Muşnāti doşānmüşa yā sā mūseti nigadyate // - Upādānaṁ bhavettasyā mrttikā lohameva ca /
Rasaratna Samuccaya, 10/1-3.
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