On Oct 4, 4:52 am, Darrel Toepfer wrote:
Ron Wanttaja wrote :
...

Can "transparent aluminum" be far behind?


It's here now. Aluminum Oxide is transparent which is why telescope
mirrors which have a very thin layer to minimize defects, have to be
realuminized every few years ago.

That is also why the decision to change from Gold to Aluminum for
CDs probably reduced their archival life by several decades, just
my guess.

--

FF