Over the years the type of wax used in cylinders was improved and hardened so that cylinders could be played with good quality over 100 times. In 1902 Edison Records launched a line of improved hard wax cylinders marketed as "Edison Gold Molded Records". The major development of this line of cylinders is that Edison had developed a process that allowed a mold to be made from a master cylinder which then permitted the production of several hundred cylinders to be made from the mold. The process was labeled "Gold Moulded" because of the gold vapor that was given off by gold electrodes used in the process.