[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) › c28.s3.13 # History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c28.s3.13 History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c28.s3.13 - **Language:** English ### [c28.s3.13](https://indike.org/pramana/ins.science.ray-1956.c28.s3.13) \*Rajavarta\* (lapis lazuli) has a bluish tint but with slight admixture of red .... it is killed by being powdered in combination with lemon-juice and sulphur, and roasted seven times in a covered crucible. 149-153 - [Previous: c28.s3.12](https://indike.org/pramana/ins.science.ray-1956.c28.s3.12) - [Next: c28.s3.14](https://indike.org/pramana/ins.science.ray-1956.c28.s3.14) - [Up: c28.s3](https://indike.org/pramana/ins.science.ray-1956.c28.s3) --- Source: [https://indike.org/pramana/ins.science.ray-1956.c28.s3.13](https://indike.org/pramana/ins.science.ray-1956.c28.s3.13) · Pramāṇa