In this post I will tell you How to tell when your knife is sharp. In the past I have been told that you should drag your thumb along the blade, that way is okay but you can cut your thumb very easily. Other people have suggested that I try to shave with the knife. That only works if your knife is razor sharp.The way I like is to get a hunk of wood and whittle on it if your knife is sharp the shavings should be long, thin, and curly. Here is a pitchers of what it should look like.