Regarding CDs, the pits are in a thin photoresist layer that is spun onto
the glass substrate.
Media Sciences, Inc.
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of George Brock-Nannestad
> Sent: Saturday, January 22, 2011 6:09 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] How many 78s to the Matrix
> From: Patent Tactics, George Brock-Nannestad
> Stewart Goodeman wrote [quote]:
> I know in 1943, when they recorded the Rodgers and Hart
> > revival of "A Connecticut Yankee" they actually used glass.
> ----- just to avert any confusion: glass means that the disc that
> the layer that the cut was made in was made of glass. The layer could have
> been lacquer, or it could have been wax, both were used. It has been
> that glass was a cheap substitute for aluminum that was the most used
> material for lacquer mastering discs, due to other uses for aluminum
> the war. But in fact, the quality of the cut in glass-based discs was
> than for aluminum, because the surface of glass was much smoother.
> This is very different from the use of glass in the manufacture of CDs;
> the pits are really represented in the glass as a stage of manufacture.
> Kind regards,