Green tea is an environmentally sound substitute for diamond polishing compound used in the preparation of super-smooth hard-disk read-write heads.
John Lombardi, at Ventana Research based in Tuscon, Arizona in the US, suspected that green tea might also provide be an effective compound for polishing magnetic read-write heads. This was because tannin, a chemical that gives tea and coffee a bitter taste, binds to certain ceramic and metal materials. It is this quality that causes it to stain teapots and mugs…