I just ground the chisel, literally a triangle of hardened steel a quarter inch thick and an inch long. Halfway through the chisel was too hot to touch, so I brought a spray bottle over and sprayed the chisel every 5 seconds or so.
Total grind time was about five minutes, no tempering colors appear anywhere on the chisel.
Ian, large amounts of metal should only be removed as a matter of practice when steel is annealed, and I wouldn't want to use a nickel electroplated wheel on soft metal.
Too much of what I did today would probably result in short wheel life.