So you find out that your kitchen knife has
become blunt and you need to sharpen it. No, you need not call a
professional for it, nor do you need any fancy tool for the job. Just
get hold of a coffee mug from your kitchen cabinet and follow the
instructions -
bottom of mugs have an abrasive surface, so knife can be sharpened.
Put the blade flat and raise its back at angle of 20 degrees.
Height should be enough to fit your finger.
Wet the surface a little to keep the pores clean
Grind the blade across the edge while maintaining a 20 degree angle.
repeat with the other side.