[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) › v1.c21.1 # A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c21.1 A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c21.1 - **Language:** English ### [v1.c21.1](https://indike.org/pramana/ins.science.ray-1902.v1.c21.1) According to the Hindu alchemists, there are four kinds of the ash (\*bhasma\*) of mercury, namely black (\*kajjali\*, p. 61), red (vermilion), white and yellow.¹ The white variety is often spoken of as rasakapūra or camphor of mercury; it is often found to be almost pure calomel and sometimes a mixture in indefinite proportions of calomel and corrosive sublimate. - [Previous: v1.c20.12](https://indike.org/pramana/ins.science.ray-1902.v1.c20.12) - [Next: v1.c21.2](https://indike.org/pramana/ins.science.ray-1902.v1.c21.2) - [Up: v1.c21](https://indike.org/pramana/ins.science.ray-1902.v1.c21) --- Source: [https://indike.org/pramana/ins.science.ray-1902.v1.c21.1](https://indike.org/pramana/ins.science.ray-1902.v1.c21.1) · Pramāṇa