To my mind there are two types of problem.
-- Surface blemishes are relatively easy to see and span the range from
actual cracks and gouges and dimples, to small-area abrasions of
different depths -- plus fingerprints and mold, never good signs.
-- Groove wear in a well-handled (or machine-handled) disc can easily escape
notice until a grayish pall from too much use overtakes the usually hard
surface of the groove walls. This condition is far less easy to rate in its
intermediate stages, although a corollary indicator can be the condition of
the center hole.
On Tue, Aug 5, 2008 at 2:01 PM, John Ross <[log in to unmask]> wrote:
> Is there a set of established standards for visual evaluation of 78 rpm
> discs? I'm working with the owner of a significant collection to catalog the
> discs and ultimately transfer them to digital form. I would like to include
> a preliminary note about the apparent condition of each disc as part of the
> preliminary catalog.
> Obviously, the ultimate evaluation of each disc requires playing it, but as
> a first step, I want to go with a visual examination.
> So I will welcome your pointers to any kind of commonly accepted terms for
> describing 78s. Thanks in advance.
> John Ross