Cassette tapes are produced of a polyester type plastic celluloid with a magnetized coating. The gamma ferric oxide (Fe2O3) was the basis of the original magnetized stuff. About 1970, a doping cobalt volume procedure with a double-coating method to heighten overall tape output levels was developed and introduced by 3M company.
Coldplay
Rembrandt Van Rijn
Ashanti
Antoni Tapies
Faith Ringgold
No comments:
Post a Comment