You can use the HHT to test the progress of the razor from 4k to 8k through 12k, but that will just be so that you can see how the hair reacts to an edge which is not sharp enough or wire edged. I have VERY fine hair and do use the HHT after stropping, but only to confirm that the razor will effortlesly and silently cut my own hair. If that happens, it's definitely time for the shave test.

Also, I think the wet nail test is a very aggressive test for the new edge. I only use it to detect burs and nicks.

We haven't talked about the paper towel test though. Has anybody been using this one?

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