Osma’s styptic pencil (aluminum sulfate) is used whenever you cut yourself. It is far more intense and not the same thing as the Osma potassium alum blocks.
This is much like styptic pencils you can get at a corner drugstore, at least they’re the same aluminum sulfate, but Osma as usual has found a way to incorporate more retained water in the device.
While no application of a styptic pencil’s as fun as watching “Star Wars” the first time, this easily is the least irritating one I’ve tried of about half a dozen.
Kind of a must for a first-time shaver. Made in France.
This pencil’s ~0.4 oz (12g) of product, weighs ~0.6 oz (17g) in its reservoir, and takes up 0.6 x 4.1″ (15x104mm) in a travel bag.
To use, hold the tip under the running faucet tap for a second and apply with gentle pressure to the cut.
Do not share this device with anyone, it is like a hypodermic needle in that regard!