“I use double edge blades made by derby and gilette. They both have
markings, i.e. 1,2,3,4 and L,R on their sides. Does this mean you can reverse
the blade for a longer durability?”
In my experience flipping the blade around doesn’t have an effect on durability. I have no idea why the numbers are there.
Thought I had seen a post on one of the shave discussion boards about it being there for manufacturing purposes. Something about ensuring uniform quality of both of the blade surfaces.
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