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Add RCA's red vinyls to the unbreakable list.

David Lennick wrote:
> For starters, the only 78s that are truly unbreakable are the ones made 
> for mood music libraries (Chappell, Boosey & Hawkes et al) in the 50s 
> and Capitol's "Superflex" kids records in the 40s. Everything else can 
> be cracked by putting your thumbnails together and pushing 
> up..experimenting this way on unwanted discs is a good way to learn 
> which ones will and which ones won't. Even Decca LPs from the mid 50s to 
> the early 60s will fail this test.
> 
> Other than that, it may be a matter of what country you're in. Canadian 
> plants kept 78s into 1960 and all but Quality used shellac, while 
> Quality's vinyl was easily cracked.
> 
> dl
> 
> MATSUBAYASHI 'Shaolin' Kohji wrote:
>> Hi, and happy new year all,
>>
>> I'm just curious - what can I distinguish shellac 78rpms from
>> other thick vinyl-made 78rpms, not only by reading labels saying
>> such as "Merco Plastic" or "Non-breakable"?
>>
>> The last era of vinyl 78rpms can be easily distinguished just
>> because they are very thin and flexible. But other type of vinyl 78rpms,
>> as well as very early LPs, are not flexible and rather thick.
>> I've been wondering whether the last era of thick 78rpms (late 1950s
>> to early 1960s, for example) are actually made either of shellac
>> or thick vinyl.
>>