I just finished forging a small wood carving knife for the first time. I heated it to non-magnetic and quenched it in oil. A file test told me the blade was hard. To anneal it, I put it in an old toaster oven at 425 degrees for one hour. When I checked it afterwards, there was no color on the blade (straw, blue, etc.) I put it in for another hour and there was still no color. Is this normal? I've seen heat treating in a coal fire and you can watch the colors progress.