Iron casting is one of the oldest professions of mankind. Iron technology is assumed to have been introduced to Korea around the 5th~6th centuries BCE. According to “Dongyichuan (Biographies of Dongyi) in Weishu (Book of Wei)” from Sanguozhi (Records of the Three Kingdoms), Koreans produced and traded iron ware. Considering the crucial role of iron in the development of civilization, iron technology and smiths were matters of national interest in ancient states. With the introduction of Buddhism to the Korean peninsula, Buddhist temples were built all over the country, and numerous temple bells were cast. Naturally, bell founding became an important profession. Korean temple bells are characterized by their clear sound with deep resonance and exquisite surface decoration. Mostly shaped like upturned crockery jars, Korean bells typically have a dragon-shaped hook and a sound tube at the top. The oldest known temple bell in Korea is the Bronze Bell of Sangwonsa Temple in Odaesan Mountain, made in 725 during the Unified Silla Period. In terms of size and aesthetic value, the Sacred Bell of the Great King Seongdeok, dated 771, is considered peerless. Korean temple bells were traditionally cast using beeswax models. Though they vary according to the size of individual bells, Korean traditional-style temple bells are basically cast with an alloy of copper (80%) and tin (17%). For the model, beeswax is mixed with cow fat at a ratio of 8:2, but the ratio changes according to climate. The authentic bell founding process is as follows: bricks are piled to form a support mount slightly smaller than the intended bell size; a mixture of clay and sand is applied to the brick mount until the intended bell form is obtained, and the surface is smoothed out with a mixture of graphite powder and water; a wax model engraved with all the decorative patterns is made over the mount; the model is covered twice with a thick mixture of clay and coarse sand and allowed to dry; heat is applied to melt the wax inside; molten alloy is poured into the cavity; after the alloy cools and hardens, the mold is removed, the bell is trimmed, and the surface designs are given their final touches.