It's the wear on the razor blade. Look closely at the top center center/right of the edge of this blade.
You can see just a slight variation, which is blade wear and makes my face red!
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Used Gillette Fusion Razor Blade (about 2 weeks) old.
Captured Using:
Nikon SMZ-1500 Stereo Microscope
Nikon DS-L3-Fi2
Excel Technologies Fiber Optic Ring Light



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