[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D.](https://indike.org/pramana/ins.science.ray-1902) › v2.c32.s16.37 # A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c32.s16.37 A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v2.c32.s16.37 - **Language:** English ### [v2.c32.s16.37](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.37) Cf. "The red ruby, at a high temperature, is colourless: on cooling it first becomes green, after which it gradually assumes its original fine red colour." (Bauer and Spencer). "The blue colour of the sapphire disappears on heating."—Ibid. - [Previous: v2.c32.s16.36](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.36) - [Next: v2.c33.1](https://indike.org/pramana/ins.science.ray-1902.v2.c33.1) - [Up: v2.c32.s16](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16) --- Source: [https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.37](https://indike.org/pramana/ins.science.ray-1902.v2.c32.s16.37) · Pramāṇa