[78-L] glass record mystery

[Kristjan Saag]

As noted, glass was used in the war years for lacquers because it was 
cheaper than aluminium. And the cheapest way to produce glass is to use 
recycled glass: from bottles and bulbs and broken glassware etc. Glass 
separation, in the 1940's, wasn't what it is in these days; probably all 
sorts of waste glass was used, so the end product wasn't transparent.
Kristjan


On 2016-09-05 07:02, Joe Salerno wrote:
> 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?


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