[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.s3.25 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c17.s3.25 History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c17.s3.25 - **Language:** English ### [c17.s3.25](https://indike.org/pramana/ins.science.ray-1956.c17.s3.25) "\*Rasaka\* (calamine) · There are three kinds of it : namely, of the colour of earth, of the appearance of treacle, and of the colour of stones What wonder is it that \*rasaka\* mixed with (certain organic matters) and roasted three times with copper converts the latter into gold ?" - [Previous: c17.s3.24](https://indike.org/pramana/ins.science.ray-1956.c17.s3.24) - [Next: c17.s3.26](https://indike.org/pramana/ins.science.ray-1956.c17.s3.26) - [Up: c17.s3](https://indike.org/pramana/ins.science.ray-1956.c17.s3) --- Source: [https://indike.org/pramana/ins.science.ray-1956.c17.s3.25](https://indike.org/pramana/ins.science.ray-1956.c17.s3.25) · Pramāṇa