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.

Process reprinted from OMNI Magazine, November 1987, page 76.  (local PDF) (local CBR) (right-click -> save as to download))

From How To Make Your Own Superconductors, by Bruce Schecter.  Retyped as faithfully as possible.  Hyperlinks mine, added for …