First, Sorry for my nick. I tried approx. 50 nicks and they were all taken..
Second, This is for people who are interested. It was quoted and translated out of Britannica (http://www.britannica.com) New Hebrew Edition
"Alchemy is the name of an ancient art, used to change ('transmute') certain metals to other metals (such as copper to gold and silver)"
"In the Middle Age people still believed that Aristo, the Greek Philosopher, was right when he said that anything under the sun was made out of four elements - Earth, Air [Wind], Fire and Water.
They ('the alchemists') estimated that all the different materials (included in which, the metals, ofcourse.) are only different one from another in the four elements that they are made of, and they estimated that by changing the elements you can turn one metal to another.
The Alchemists in that time (abt. 1400 TC) believed in the existence of the "Philosopher's Stone" or "The Elixir" that had the strength to turn normal metals (i.e. copper) to gold and silver, and in few people's opinion - heal every sick person and assure mankind eternal life. This `magic` was called in Arabic, Al-chemy. (Al = The in arabic, i.e. Al madrasa - The School)"
"The Alchemists have been searching for this "stone" hundreads and hundreads of years. People in the community of the alchemists like "Roger Bacon" and Albertos Magnus, known by their good heart and honesty and have discovered great alchemy achievements, Even though many of them were liers and scums."
"In castles, weird people would whisper magic words over bubbling bowls in hope to see many gold for their work. There were people in castles trying to produce gold from copper and [unknown word in english] alone, yet others pereferred to mix for their tests with copper and [unknown word in english], [another unknown word] and Amonium."
I thought this would be enough to explain.. Hope you think it's good.
-Coma