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DE razor geometry. A system for measuring aggressive razors.

I reviewed my post with the cut paper and I realized I was looking at the wrong surface. This made me think, what about scanning a manually drawn orthogonal projection of the razor profile? 20210811_192457.jpg
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The obvious issue here is not the precision of the camera, but that of my fingertips. However, this obstacle could be eliminated if I could take a "footprint" of the razor profile on a sheet of paper, then scan it. What do you think of this idea? To the chemistry experts: how can you use carbon paper with a DE razor instead of a writing instrument? Any alternative to carbon?
 
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