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ABOUT
The Urdhvapatan-Yantra is mostly used to procure Parad(sublimation of mercury). The apparatus setup requires two earthen jars sized such that the bottom of the upper will seat on and seal the mouth of the lower jar. Medicine (Mostly Parad (Mercury)) triturated with the prescribed drugs is placed in the lower jar. The joint is sealed with seven layers of mud-smeared cloth and allowed to dry. The upper jar is filled with cold to ensure that the lower jar is always cool. These are placed above a fire and heated for the prescribed time. Cold water is constantly renewed in the upper jar so as keep the bottom of the jar cool. Evaporating Mercury will cool and condense on the bottom of the upper jar. After the prescribed time they are cooled and seal is carefully broken. Collected mercury on the bottom of the upper jar is removed, washed and dried for use. Here, ³rdhva refers to the upward movement of mercury in the process.
Parada Purification [Asht-Sanskar] (Standard Procedure , 8 steps of purification) 
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