The biggest feature of the Damascus knife is that the blade is covered with various patterns, such as clouds like water, wonderful abnormal. This pattern is formed in casting. For a long time in the past, the unique smelting technology and forging method of the Damascus leather sword has been a technical secret of the Persians, which is not known to the outside world. The Damascus Knife is represented by Iran. Iran's ancient iron weapons are very famous, at that time Mongolia, India, Turkey and the royal family of the Eastern countries are hired Persian craftsmen cast weapons, but the shape of the weapons of different countries, and the blade maker did not leave inscriptions, with the passage of time, people can not identify this is Persian man-made, so can only use Iran's own weapons as a representative. In contrast, the smelting pattern steel blade produced in Persia, its vein is like silk weave, shiny; The patterned steel blade produced in India, its transverse vein is often dozens of layers of cloud trapezoid, the so-called Muhammad ladder, Kit Kat precious; The Turkish knife has a rolling pattern, and its veins are like agates.