A light yet highly workable magnetic substance is disclosed which consists mainly of a wholly novel material, fine crystal spherical carbon represented by C.sub.n X.sub.m where n is an integer selected from the group consisting of 60, 70, 76, 84, etc., m represents a positive number not more than n and...http://www.google.com.au/patents/US5589038?utm_source=gb-gplus-sharePatent US5589038 - Magnetic substance
