Archeological and historical data provide knowledge about smelting and processing of colored metal in Kaunas. As soon as in the 15th century in Kaunas there already worked goldsmiths, in the second half of the 16th century bells were cast, at the beginning of the 17th century - probably artillery cannons were cast. The first known bell craftsman, Martin Hoffman, at the end of the 16th century worked in Kaunas where he cast two known church bells. During archeological investigations performed in Kaunas City Hall Square and the territory of former Bernardine monastery, two colored metal foundries were discovered (Pic. 1). The found samples of colored metal, product chips, and a bell mould prove that colored metal was smelted there. The foundry discovered in City Hall Square stood in the yard of barns built at the end of the 16th century - the beginning of the 17th century. The remaining subterranean part of the foundry consists of a brick ash shaft with ventilation and cleaning openings, and a stairwell in the western part of the shaft. The metal smelting chamber and moulding pit did not remain (Pic. 2-6). Above the round shaft there stood a burning chamber where wood was burned, and the ashes went into the shaft. Heat torrefied the smelting chamber where raw material was put. The mould of the product stood in a pit situated behind the smelting chamber (Pic. 7). The remaining part of the foundry can be seen in the internal yard of the Communications Museum of „Lietuvos telekomas“ (Pic. 8). […]