The ceramic knife is out of order. You can use a sharpening stone
Or available steel file. This file has the hardware store to buy, not too big, but a little thin. The main file is the blade. Most of the blades are serrated, causing discomfort. Note: do not use twisted ceramic knife, straight to the best.
The use of ceramic knife for a long time, blade is not sharp, you can find a workshop directly let him help you re open the wheel under the liqueur, it can continue to use the new sharp.
Ordinary grinding grindstone steel is not used for grinding ceramic knife.
