We already know from the web that many tapes use Fe2O3 (until it was replaced by CrO2 and more complicated stuff). Let's get some in a science lab shop, and figure out how to synthesize it later.
We already know from the web that many tapes use Fe2O3 (until it was replaced by CrO2 and more complicated stuff). Let's get some in a science lab shop, and figure out how to synthesize it later.