Dr. S. Kalyanaraman wrote:

In my contribution on Indian Alchemy which appeared in the late Prof. Debiprasad Chattopadhyaya's History of Science and Technology in Ancient India, Vol. II, I had suggested that soma in the vedic tradition connoted electrum (gold-silver alloyed ore). I have a detailed monograph to substantiate this.
I would be interested in knowing about tantric studies on alchemical practices, in particular and metallurgical/chemical experiments, in general.