Step 10: Improvised Sharpening Stones
There you are in your friend's kitchen trying to cut a tomato with a blunt knife.
You're mashing it and smearing the skin around and not feeling sexy at all.
You ransack the utensil drawer and find not an abrasive.
You get the urge to criticize your pal for being the wrong kind of tool-using ape.
Use an improvised stone instead. Here's a short list of what can work:
The underside of the toilet tank lid.
The rough unglazed ring on the bottom of a plate or other ceramic item.
an emery board used for manicures
Any aluminum item. It's covered with a layer of aluminum oxide, a good abrasive. This method is only good for final sharpening.