I've read enough posts on flipping DE blades to realize that (1) flipping blades doesn't necessarily improve their lifespan and (2) most shavers can't be bothered flipping them, since the blades are so cheap in the first place.
But why is it that blades typically (not not always) have notations on their corners? On Derbies, you'll see a "1" and "2" on the kitty corners of one side, and a "3" and "4" on the kitty corners of the other side?
I've seen similar numberings on the Gillette Silver Blue, Polsilver Super Super Iridium, Personna, and Astra.
But why is it that blades typically (not not always) have notations on their corners? On Derbies, you'll see a "1" and "2" on the kitty corners of one side, and a "3" and "4" on the kitty corners of the other side?
I've seen similar numberings on the Gillette Silver Blue, Polsilver Super Super Iridium, Personna, and Astra.