Materials
Jian were originally made from bronze, then steel as metal technology advanced. There are some, perhaps ceremonial, jian which are carved from a single solid piece of jade.
Traditional jian blades are usually of sanmei (three plate) construction, which involved sandwiching a core of hard steel between two plates of softer steel. The central plate protrudes slightly from its surrounding pieces, allowing for a sharp edge, while the softer spine protects the brittle core. Some blades had wumei or five plate construction, with two more soft plates being used at the central ridge. Bronze jian were often made in a somewhat similar manner: in this case an alloy with a high copper content would be used to make a resilient core and spine, while the edge would be made from a high tin-content alloy for sharpness and welded on to the rest of the blade.
The sword smiths of China are often credited with the forging technologies that traveled to Korea and Japan to allow sword smiths there to create such weapons as the katana. These technologies include folding, inserted alloys, and differential hardening of the edge. While the Japanese would be more influenced by the Chinese dāo (single-edged swords of various forms), the early Japanese swords known as ken are often based on jian. The Korean version of the jian is known as the geom or gum, and these swords often preserve features found in Ming-era jian, such as openwork pommels and sharply angled tips.
In martial art schools wooden swords are used for training, so most martial arts students' first experience with a jian in modern times is with one of those weapons. In some religious Taoist sects, those wooden practice swords have come to have an esoteric ritual purpose, claimed by some to metaphorically represent the discipline of an accomplished student.
Contemporary jian versions are often forged (shaped with heat and hammer) and assembled by mostly traditional methods for training of practitioners of Chinese martial arts around the world. These jian vary greatly in quality and historical accuracy.
Contemporary jian are also sometimes forgeries (artificially aged and misrepresented as original antiques), for sale to tourists and collectors who cannot distinguish them from true antiques.
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