[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) › c21.8 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c21.8 History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c21.8 - **Language:** English ### [c21.8](https://indike.org/pramana/ins.science.ray-1956.c21.8) Copper, treated with the above preparation of mercury and rubbed with the acids, alkalies and the milky juice of \*Calotropis gigantea\*., and roasted in a crucible, turns into gold. 18-20 - [Previous: c21.7](https://indike.org/pramana/ins.science.ray-1956.c21.7) - [Next: c21.9](https://indike.org/pramana/ins.science.ray-1956.c21.9) - [Up: c21](https://indike.org/pramana/ins.science.ray-1956.c21) --- Source: [https://indike.org/pramana/ins.science.ray-1956.c21.8](https://indike.org/pramana/ins.science.ray-1956.c21.8) · Pramāṇa