[Dixielandjazz] acetate or Cardboard

[Robert S. Ringwald]

Regarding the 1939 out take of Bing Crosby, jack Tracy says:

 (snip)
It probably was a disc then commonly used to make copies of recordings. As I
remember, it was a thin sheet of metal coated with what was probably acetate
and was unbreakable and  somewhat flexible. I would guess that's what your
grandmother was given.

  There were cheap cardboard-like discs also available for making home
recordings, but they wouldn't have been used by any professional who made
copies of recordings on professional equipment for a price.

  Most 78s were made of shellac and were stiff, unyielding and could  easily
be cracked or broken.
(snip)

I am pretty sure that it was what Jack says, "thin sheet of metal coated
with what was probably acetate and was unbreakable."  It definitely was not
one of the cheap cardboard discs.