This document provides an overview of the history and concepts of Parada (mercury) in Rasashastra. It discusses:
1) The 18 samskaras (processes) used to purify Parada like Swedana, Mardana etc.
2) The 4 types of Parada bhandhas (amalgamations) used - Jalauka Pakwa, Khota Pishti, Pata Parpatika, Bhasma Bhuthisama.
3) Different colors and properties of Parada bhasma (calcined mercury) like Sveta (white), Udaya Bhaskara (red).
4) Shodhana (pur