The classic not stainless carbon steel still has its right to exist even in the age of ultra-modern powder metallurgical steels. Many users appreciate not only the traditional aspect, but also the combination of cutting durability and easy sharpening that stainless steels have never achieved. A grey-blue tarnishing of the blade is completely normal and in no way constitutes a defect. On the contrary, the resulting patina forms a protective layer on the blade, which increases its resistance to external influences. This layer is often visible after the first use and cannot be removed.