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You Will Need
Use a whetstone
Use a whetstone, usually made of granite, to sharpen your jackknife. Find them at many outdoor, camping, or kitchen stores.
Position the blade
Position the blade against the stone at a 30-degree angle on the stone, with the back of the blade tilted off the stone a third of the way to vertical.
Sharpen one side
Push the blade across the stone as if you were slicing a thin layer off the top of the stone.
Sharpen other side
Pull the blade across the surface of the stone the same as before, but towards you to sharpen the other side of the stone.
Check the sharpness
Check the sharpness by holding the blade under a bright light or sun light.
Clean the stone
Clean the small bits of metal off the stone by slapping it on your hand.
Repeat to sharpen
Repeat these steps until your jackknife is sufficiently sharpened. Use it with care.