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Though the block hadn't seemed very rough to me before, I dug it out and rubbed it with my fingers under the faucet until it felt smooth as glass. Used it after my shave with no irritation! Strange...

Bought one at a local outdoor market for less than a dollar. Never had any luck with it, though. Doesn't burn much at all, but it causes a whole lot of redness and itching that persists for a while....