[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray](https://indike.org/pramana/ins.science.ray-1956) › c36.s4 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c36.s4: Chemistry in Rasaratnakara of Nityanatha. History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c36.s4 - **Language:** English ### Chemistry in Rasaratnakara of Nityanatha. ### [c36.s4.1](https://indike.org/pramana/ins.science.ray-1956.c36.s4.1) \*Test for killed mercury\*—When the substance, being heated over a fire of paddy husks, remains unaltered in weight, it should be considered as reduced to a calx ### [c36.s4.2](https://indike.org/pramana/ins.science.ray-1956.c36.s4.2) Purified mercury should be stored in the hollow of a tooth or horn or bamboo ### [c36.s4.3](https://indike.org/pramana/ins.science.ray-1956.c36.s4.3) Directions for making factitious cinnabar (\*makaradhvaja\*) are here given. --- Source: [https://indike.org/pramana/ins.science.ray-1956.c36.s4](https://indike.org/pramana/ins.science.ray-1956.c36.s4) · Pramāṇa