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The secret of steel "ageing": how time changes the blades of knives and razors

The term 'aging' in the context of metalworking is usually associated with the natural or controlled microstructural changes that occur after the quenching/ tempering process. In the case of knives and razors, this phenomenon can have a significant effect on the behaviour of the blade, its cutting properties and its service life. In this article, we will discuss what steel ageing is, how it occurs and why it is of particular interest to vintage [...]