Is it time to change utility knife blades?
I mark my freshly changed utility knife blades so I’ll know whether they will need to be changed after I flip them to a fresh edge. The main advantage is that it saves me the frustration and disappointment of flipping to an already-dull edge.
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Can you really not tell when a blade is dull?
Besides all the markings on it from cutting and the oil residue, you can run it perpendicularly across your fingernail to see if it's still sharp.