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I wonder what an industrial engineer would say about all the different blades out there. If there are genuine differences in how they are manufactured, I'd be curious.

Without double-blind...

I've used Derby, Feather, Merkur, Bluebird, and Shark, and gotten fine shaves with all of them. I seem to have the best shaves on the second day of using any blade. I don't use any of them past four...