Blue Amberol Records was the trademark for a type of cylinder recording manufactured by the Edison Records company in the U.S. from 1912 to 1929. Made from a nitrocellulose compound developed at the Edison laboratory—though occasionally employing Bakelite in its stead and always employing an inner layer of plaster—these cylinder records were introduced for public sale in October 1912. The first release in the main, Popular series was number 1501, and the last, 5719, issued in October 1929 just as the Edison Records concern closed up shop. The Edison company also maintained separate issue number ranges for foreign, classical and special series that are not included here. The issue numbers are not necessarily continuous as some titles were not released, or otherwise skipped. Nevertheless, th