Some of the modern white painted floresent ballasts have a row of 7/8th square steel plates in them, heaps as they are stacked.
You need a chisle to break apart the iron core, first you have to peel the backing plate off, then break it apart.
You also end up with about 100gms (1/5th Lb) Copper wire in the common largish ballast.
They can be used as 'Tiles'. Its easy to lay them out and spraypaint them.
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