Greenday Cassette - An Overview
Cobalt-adsorbed iron oxide (Avilyn) was introduced by TDK in 1974 and proved quite productive. "Kind IV" tapes applying pure metallic particles (versus oxide formulations) were being introduced in 1979 by 3M under the trade name Metafine. The tape coating on most cassettes offered as of 2024 are both "usual" or "chrome" is made of ferric oxide and