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The dark spots you see could very likely be pitting, Check out this picture below. The dark line running from toe to heal was a long line of pits. At first I thought it was gunk or tarnish, but after...

did you check out the handsanding howto sticky? very helpful indeed.

http://straightrazorpalace.com/workshop/17007-handsanding-howto.html

I recently sanded 2 blades with deep pitting. What I...