[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) › c17.s2.4 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c17.s2.4 History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c17.s2.4 - **Language:** English ### [c17.s2.4](https://indike.org/pramana/ins.science.ray-1956.c17.s2.4) I shall now describe the \*garbha yantram\* for reducing \*pistika\* (a cake of mercury and sulphur) to ashes. Make a clay crucible, 4 digits in length and 3 digits in width, with the mouth rounded. Take 20 parts of salt and one of bdellium and pound them finely, adding water frequently; smear the crucible with this mixture. Make a fire of paddy husks and apply gentle heat. - [Previous: c17.s2.3](https://indike.org/pramana/ins.science.ray-1956.c17.s2.3) - [Next: c17.s2.5](https://indike.org/pramana/ins.science.ray-1956.c17.s2.5) - [Up: c17.s2](https://indike.org/pramana/ins.science.ray-1956.c17.s2) --- Source: [https://indike.org/pramana/ins.science.ray-1956.c17.s2.4](https://indike.org/pramana/ins.science.ray-1956.c17.s2.4) · Pramāṇa