An oxide is a compound in which oxygen is bonded to one or more electropositive atoms. Probably the most commonly known of all oxides, iron oxide is a dark-red, crystalline, water-insoluble solid, Fe 2 O 3, occurring naturally, as hematite and rust, or synthesized: used chiefly as a pigment, as a mordant, as a coating for magnetic recording tape, and in the manufacture of polishing compounds.
While it forms a coating for magnetic recording tape, iron oxide can also make sound in other ways in its common form of rust. Rust can inhibit the movement of metal against metal and cause hinges to squeak and larger joined metal pieces to groan with movement.
This recording includes recorded sounds of metal squeaks, squeals and groans, manipulated and filtered to create the finished work you find here.