Thank you, Nara.
The similarity between the alchemists of Europe and the Tantriks of India has been studied extensively.
There is an good book on Alchemy --Alchemy and Alchemists by Sean martin
He has written about Chinese and Indian Alchemy also.
I quote from that book.
Indian Alchemy
Alchemy is credited with evolution of Homeopathy.
I had answered this question earlier .
2. Why did they want to live for ever?
If siddhars were obsessed with converting mercury to gold, the motivation must be nothing more esoteric than that of the alchemists of Europe.
The similarity between the alchemists of Europe and the Tantriks of India has been studied extensively.
There is an good book on Alchemy --Alchemy and Alchemists by Sean martin
He has written about Chinese and Indian Alchemy also.
I quote from that book.
Alchemy has also been seen as a spiritual path,undertaken by students studying under an adept or master.From the earliest times,this is how alchemy was studied.With the beginnings of modern science in the seventeenth century,alchemy became more and more an inner discipline.Writers such as Jakob Boehme (1575–1624) and Thomas Vaughan (1621–1665) were almost certainly total strangers to the laboratory.These writers often equated the Philosopher’s Stone with Christ,and can be seen as mystics as much as alchemists.
The mystical branch of alchemy produced countless allegories of spiritual development.Pre-dating John Bunyan by fifty years or so,is the remarkable The Labyrinth of the World and the Paradise of the Heartby JA Comenius.In this,the narrator is led through an endless city where he witnesses all forms of human folly.In the end,he is saved only by his faith in God.In addition to Comenius, there are countless shorter works,such as Thomas Vaughan’s House of Light and Tommasso de Campanella’s City of the Sun.
Indian Alchemy
As with alchemy in China,the underlying aim of the work is to free the alchemist from the constraints of time.While the materials are being worked on,the alchemist is still in the state of becoming.Mercury has to be fixed or ‘killed’(this is identified with the ego).The end of the work,in which the metals (and Nature – both nature in general and the alchemist’s own nature) are ‘perfected’,sees the alchemist reach the state of pure being, in which there is no past or future,no further striving upwards, but an abiding state of clear,mindful existence.
Alchemy is credited with evolution of Homeopathy.
Also, if Siddhars are supposed to be interested in spiritual life and all that jazz, why were they interested in extending mere material life in the first place anyway?
I had answered this question earlier .
2. Why did they want to live for ever?
It a a very long time to attain Siddhis. The idea is that you spent almost one life time in the practice of Yoga and attaining Siddhis. Then you seek Spirituality. The Siddhars search for Kayakalpa and para kaya pravesa were all based on this concept. Attain perfect control over your body as it is the instrument for seeking Spiritual attainments.
Again this has a lot of relevance to their philosophy. We will discus that later.