Write some historical facts when alchemists attempted to convert cheap metals to gold.
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Solution
Alchemists believed everything in the world was made up of four elements like air, earth, fire, and water.
Alchemists believed they could refine base metals such as iron into precious metals such as gold if they could just find the mythical substance called philosopher's stone.
Philosopher's stone was not actually a rock, but it was supposed to be a magical wax, liquid, or powder.
This stone had prolonged life as well as changed base metals into precious metals.
The iron pillar near the Qutub Minar in New Delhi was made around 400 BC by the Indian's worker.
They had developed a process which prevented wrought iron from rusting.
It is due to the formation of a thin film of magnetic oxide on the surface.
It results in a finishing treatment given to the pillar, painting it with a mixture of different salts, then heating and quenching.