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This is how a quality knife made of pure steel is distinguished from a knife made of ordinary iron. A knife made of ordinary iron, its characteristics are that when it is bent it does not break. However, if the knife is made of steel, if the knife is bent it will break.
This videois explained, among others:
1. how to choose a good knife
2. how to distinguish steel knives and iron knives
3. how to sharpen a knife