Before I retired one of my jobs was overseeing a rather large digitizing project and the reports of CD failures and personal experience in hard drive failures led to further research and the discovery of the Mitsui gold CD. It think it is now manufactured as MAM-A gold. At the time we were paying about 80 cents per CD and saved all the files on the gold CDs. These were marketed at archival CDs. Supposedly the gold did not deteriorate in the same way as more common dyes.   


MAM-A gold