[78-L] glass record mystery

[Joe Salerno]

[SHORT ANSWER]

There is not a manufacturer's name. RR-10, RR-30, and RR-31 are printed 
on the labels, but not in a consistent manner. Perhaps these are a 
manufacturer cat number. What manufacturer? Maybe Mike has a catalog. 
What was gained by making them opaque?

[LONG ANSWER, with descriptions]

There are 3 discs.

The first one has an NBC label on both sides, with RR-10 printed in 
small letters near the bottom, easy to read along with the typewritten 
info on the label. Back to this in a moment.

The 2nd disc is Blue Network label on one side, RR-30 is printed in a 
manner identical to the NBC label.

The 3rd disc is also Blue Network but only recorded on one side. This 
label is the same, with RR-30. The blank side has the manufacturer's 
label (I assume) rubber stamped GLASS, HANDLE [center hole]T CARE. The 
number on this label is RR-31 and is printed at the border of the label, 
in a circular manner, not in a place that would be easily read along 
with the other info, if there was more info.

So I'm wondering if these are catalog numbers, and that network labels 
were printed to spec with cat #s in a different place.

So revising the question from my first post, who made these discs and 
what was gained by making them opaque?

Joe Salerno

On 9/5/2016 1:53 AM, Michael Biel wrote:
>
> The lacquer composition could have more coloring agent in it than most.
> Any indication of the brand of blank?
>
> Mike Biel  mbiel at mbielcom
>
> -------- Original Message --------
> Subject: [78-L] glass record mystery
> From: Joe Salerno <jsalerno at collector.org.invalid>
> Date: Mon, September 05, 2016 1:02 am
> To: 78-l <78-l at 78online.com>
>
>
> Recently I acquired a number of glass based records. Or I think they are
>
> glass. Some say they are glass. They are flat like glass. They weigh
> like glass, sound like glass when you tap them lightly with your
> fingernail, and looking at the edge of the center hole, I don't see
> anything that looks shiny like aluminum. Dates are 1944, which would be
> the right time frame for glass.
>
> But when I attempt to shine a bright flashlight or a red laser thru
> them, they are opaque, even in a very dark room at night.
>
> Is there some reason why a glass based disc would not pass light?
>