Jim,
No, I didn't sand the color off. After tempering I did spread a drop of oil over the surface which really enhanced the colors. I think it looks quite nice with the color left on, but I suspect it wouldn't be very durable. I love the color-case hardening on my Shilo Sharps rifle, but it has much more dark blue coloring.
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The file test did leave several slight scratches on the edge but didn't "bite in" like when I was shaping the blade.
No, not sure what the brass rod test is, but after having watched most episodes of Forged in Fire, I suspect it entails trying to hammer the blade through a brass rod?