Disposable DVDs haven’t taken off with the public as many thought they wold. “Each disc contains a chemical time-bomb that begins ticking once it’s exposed to air. Typically, after 48 hours, the disc turns darker, becoming so opaque that a DVD player’s laser can no longer can read it. (Discs can live as little as one hour or as long as 60 hours.) The format has been around for a few years but hasn’t generated much interest from movie studios, video rental companies — or customers — despite experiments to deliver movies direct to consumers and eliminate late fees.”