The next step is to take a marker and color the edge in completely.

once the edge is totally colored in, take a drill bit thats the same thickness as your steel. (in this case it was an 1/8th inch drill bit)

find a flat surface and run the drill bit up and down the area you colored in. make sure you do this for each side of the blade. We do this to so we'll have a visual guide of where the edge will eventually be. I grind to about 80 percent of the final thickness of the edge. if you make it too thin, it will almost certainly warp during the heat treat.