Tolong jelaskan mengenai Alkémi Hindu dari Alkémi dalam bahasa sunda

Little is known in the West about the character and history of Hindu alchemy. An eleventh century Iranian alchemist named al-Biruni reported that they "have a science similar to alchemy which is quite peculiar to them.  They call it Rasayana. It means the art which is restricted to certain operations, drugs, compounds, and medicines, most of which are taken from plants. Its principles restored the health of those who were ill beyond hope and gave back youth to fading old age."