Well, your solution is simple.

Learn to shave and strop with a straight first, then learn to hone.

Hanging hair test is different with each hair. If it is not passing, try different hair. Or stop doing the test alltogether. It is a nice trick, but useless.

Try shaving a part of your arm to test for sharpness.

The ultimate test is the shave, but if you have not learned to shave and are still learning, then you will NOT know if it is technique, or dull razor.

Have the razor honed by a pro until you have your technique down.

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