The main concept of Rasa sastra is to transform base/lower metals into noble/ higher metals and to strengthen and maintain the body tissue in a healthy state and to cure the diseases. Therefore to achieve Lohavedha (transformation of metals) and Dehavedha (transformation of body tissues) this system of Rasa Sastra was evolved and developed. The Rasa sastra has laid stress on the Rasayana concept of Ayurveda to promote positive health through prevention of ageing and diseases. The present book is the revised English translation of the Rasa Jala Nidhi. As the name denotes this book is the ocean of Rasa Sastra giving procedures for purifications of mercury, medicinal uses etc.