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RE: Almost always. Expectation bias and any number of other things.

The polycarbonate layer is not completely transparent to the CD laser. It's only 90%. Whereas optical glass is 97% or higher. That's why some Japanese CDs sound so fabulous, SHM CDs. Super High-performance Materials. They use optical glass for the clear layer. Now, image there's a liquid spray treatment that makes the clear layer behave like optical glass. That would be news, right?


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