These ads for various recording from Columbia Records<\/strong> “Masterworks” collection date from 1942-43.<\/p>\n The ads explained the wonders of their new “Sensitone-Surface” laminating process:<\/p>\n “Imagine a record made in layers, like a piece of plated silver! Inside is the \u201ccore”-outside, on the surfaces, a heavy plating of precious, highly sensitised material that would be prohibitively expensive if used in solid-stock records of the usual type. The result: A tone quality never before achieved…radically lowered surface noise – independent laboratory tests prove at least 55.3% less! Now, Columbia makes it possible to turn up the tone controls of your machine to include the \u201chigh frequencies\u201d – and play Masterworks with concert-hall realism! Now, Columbia brings you operatic recordings that really sing!”<\/em> <\/span><\/p>\n\n\t\t