For some experiment I need a conductive powder which is reasonably easy to clean. One of my options is iron powder, because it is easy to clean -- pick up with a magnet. To my surprise, the powder turned out to be non-conductive -- if I stick multimeter probes in a heap of powder there is no conductivity, not below 1Kohm anyway.
Any clue why and how to make it conductive? The only theory I have is it is oxidized, but still it seems counterintuitive.
The powder is clean, freshly out of the package, bought here http://www.amazon.co.uk/gp/product/B007JTMVD4?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s01