Red Iron Oxide -> Black

[Cyclo_Knight]

I currently have nearly 20 pounds of red iron oxide(Fe2O3) sitting in my garage, however this is not optimal for thermite. My thermite burns much hotter when I use black iron oxide(Fe3O4), so I was wondering if there is a way to turn Fe2O3 into Fe3O4. I already tried adding some steel-wool and peroxide to the Red oxide, but that only produced more red oxide.

Is this reaction possible or do I have to waste more money on black?
A Google search turned up nothing relating to this :(

[Mumble]

The method I have for preparing Iron (II, III) Oxide is pretty straight forward. Fuse equimolar amounts of Iron (II) and Iron (III) Sulfates. They will give off SO3 and you will be left with Fe3O4. Probably wont be magnetic like the mineral though.

My heating Iron (III) Oxide strongly, I believe it will reduce to Iron (II) Oxide. It will be evident by an change from red to dark brown/black. You could make the sulfates from here. If you want to try to just fuse the Oxides be my guest, but I can't guarantee sucess. The Iron (III) may just be reduced to Iron (II) and you couldn't tell them apart.