Disclaimer: Times have changed since this article was written so seek legal and scientific advice from qualified personnel if you plan to try making your own superconducting materials. I am not qualified personnel or a lawyer. Do not try this at home. We live in a world in which possession of basic chemistry apparatus is illegal in some places, so do your homework.
From How To Make Your Own Superconductors, by Bruce Schecter. Retyped as faithfully as possible. Hyperlinks mine, added for background.
Paul Grant, a research scientist at the IBM Almaden Research Center in San Jose, California, believes he has even come up with the first practice use of the new superconductors - science education. A few months after he and his colleagues had whipped up their first batch, he advised high-school science teacher David Pribyl and his students from Gilroy, California (famous for its garlic), to have a go at making superconductors themselves. Grant feels that this must be some kind of record. "In less than six months a major discovery made the trip from the research laboratory to a high-school chemistry project," Grant says. "Next year year, science fairs will have hundreds of these experiments."
The new superconductors are made up of yttrium, barium, copper, and oxygen - the chemical formula is Y1Ba2Cu3O7-x. The proportions of the yttrium, barium, and copper have lead scientists to call this material 123 - a nice coincidence since making it is as easy as that.