Re: [ARSCLIST] Preservation media WAS: Cataloguing still :-)

[Don Cox <doncox@xxxxxxxxxxxxxx>]

On 04/09/06, Dnjchi@xxxxxxx wrote:
> 
> In a message dated 9/4/2006 10:28:05 AM Eastern Daylight Time,  
> doncox@xxxxxxxxxxxxxx writes:
> 
> The  signal on a manufactured CD is basically the shape of a piece of
> plastic,  just like a vinyl LP.
> 
> 
> 
> Is a CD pressed onto the plastic? Or onto the aluminum core?

The pits are moulded in the plastic (polycarbonate), which is then
coated with a reflective metal (aluminium or gold).

The metal layer is then varnished, and usually printed over.

Regards
-- 
Don Cox
doncox@xxxxxxxxxxxxxx