About 20 years ago, a rumour started making the rounds of music fans. The claim was that you could make any CD sound better by taking a green felt marker and coating the edges of the disc. This “greening” of CDs took off.
Proponents believed this really worked. As best they could work out, the green ink absorbed stray light from the red laser that red the digital bits on the disc, somehow making it more accurate–better data retrieval, allegedly–and improving the sound.
There were even companies like AudioPrism who were the first to market with a green pen designed for the very purpose of painting the edges of CDs. That was followed by Krell, a manufacturer of high-end CD players, which sold at least one unit that bathed the CD tray in green light. Others swore that green-tinted CD-Rs sounded superior. Other similar experiments followed. Even some audiophile skeptics were won over by this simple fix. They believed that green ink made their systems sound better.
In fact, it got to the point where Sony, one of the inventors of the compact disc, studied this apparent phenomenon.
This particular craze died away, although I’m sure there are corners of the audiophile world that still experiment with green felt pens. Feel free to try it for yourself.