Conversely, the tape-type high temperature superconductors are generally made with a colloidal deposition process - which is based on a powder as a starter mate

Conversely, the tape-type high temperature superconductors are generally made with a colloidal deposition process - which is based on a powder as a starter material. Assuming this is real, that would be the obvious process by which to try and build useful conductors and magnets - it also suggests a refinement process (passing it over a magnet would quantum lock superconducting grains and let the rest slide off).