From: Patent Tactics, George Brock-Nannestad
you are right about Pyral (originally the trademark of Societé des Vernis
Pyrolac in France, an automobile varnish manufacturer).
However, the father-mother-son analogy has a bit more to do with procreation
than you would think. The father indeed has a protruding bit (the ridge that
is the negative of a groove), and the mother a mating surface. So, you might
say that in DMM the mother is directly impregnated.
> Pyral may be the inventor of the nitrocellulose lacquer alu disc,
> used for transcription, instantaneous playback, and parts
> grandmothering (since the matrix is, technically, the "father"). In
> any event, the ones made, today, by Apollo Masters (both their own
> recipe blanks and those of the Transco brand, which they also now
> make) are n-c lacquer on alu.
> As far as danger, this should be treated with the same care one would
> treat fingernail polish (don't add acetone) - but the cut-away swarf
> - or "chip" - which is stringy, and dry, is the kindling kind of
> substance which behaves not unlike its brother - magician's flash paper.
> It's certainly more fun to say that one is going to cut an
> "acetate." To say, "...cut a dub," sounds like one is going to
> emulate King Tubby. since the same word, Dub, implies a musical genre.
> - Andrew
> On Feb 29, 2012, at 1:01 PM, Steve Greene wrote:
> > I think acetate was used "in parallel" mainly as an office dictation
> > format, I've seen "Memovox" discs, Edison Voicewriter and Gray
> > Audograph
> > discs in our collections. All are very thin, the Memovox discs
> > tend to
> > be warped and brittle. Based on the "sample" I have access to,
> > lacquer
> > discs took over in the mid 1930's, replacing solid metal discs of
> > aluminum or zinc, or solid shellac discs. Shellac continued to be
> > used
> > for commercial pressings and some transcription discs through the
> > 1950's, where it was replaced by vinyl.
> > I too am under the impression that the lacquer used on laminated discs
> > was cellulose nitrate.
> > Steve Greene
> > Archivist
> > Office of Presidential Libraries
> > National Archives and Records Administration
> > (301) 837-1772
> >>>> Andrew Hamilton <[log in to unmask]> 2/29/2012 11:59 AM >>>
> > I thought it was the other way around. Acetate was replaced by
> > nitrocellulose lacquer, but the name, acetate, lives on...
> > From Wackypedia:
> > "Despite their name, most acetate discs do not contain any acetate.
> > Instead, most are an aluminum disc with a coating of nitrocellulose
> > lacquer."
> > Lacquer masters and dubs remain highly flammable - especially after
> > near-vaporization by a heated stylus. The swarf must be removed
> > carefully from the chip jar (which also has some water in its
> > bottom). Then you take a huge clump outdoors and ignite it - using
> > a 10 foot match. Weeeeeeeee!
> > Andrew
> > (P.S., I visited the DDR in 1983. Beautiful to see no
> > advertisements or other vestige of decadent capitalism. Sigh.)
> > On Feb 29, 2012, at 9:53 AM, Dennis Rooney wrote:
> >> Although the first instantaneous blanks were cellulose nitrate, the
> >> formula
> >> was later changed to cellulose acetate, hence the use of "acetate"
> >> as a
> >> cognomen for discs which are properly called "lacquer(s)". The
> >> change was
> >> prompted by some unfortunate accidents involving mastering
> >> engineers who
> >> smoked while cutting lacquers. The vast majority of surviving
> >> lacquer discs
> >> are cellulose acetate. No worries (at least not about
> > combustibility).
> >> DDR
> >> On Wed, Feb 29, 2012 at 9:20 AM, Steve Greene
> >> <[log in to unmask]> wrote:
> >>> Hello,
> >>> First time poster here. How big a concern is the storage of
> >>> transcription
> >>> recordings, a majority of which are made of coated cellulose
> > nitrate
> >>> lacquer? Coming from a moving image background, the "n" word
> >>> (NITRATE) is
> >>> scary, though presumably the volume of nitrate in even a large
> >>> collection
> >>> of coated discs is tiny compared to even a small collection of
> >>> nitrate
> >>> film. Were there components in the "recipe" for nitrate lacquer
> > that
> >>> tended to make them less combustible?
> >>> Thanks in advance for your advice, perspectives.
> >>> Steve Greene
> >>> Archivist
> >>> Office of Presidential Libraries
> >>> National Archives and Records Administration
> >>> (301) 837-1772
> >> --
> >> Dennis D. Rooney
> >> 303 W. 66th Street, 9HE
> >> New York, NY 10023
> >> 212.874.9626
> > Serif Sound CD Premastering
> > Dingbat Lacquer Sound Disc
> > Andrew Hamilton, clerk
> > 1 (513) 542-3555
> > www.serifsound.com
> Serif Sound CD Premastering
> Dingbat Lacquer Sound Disc
> Andrew Hamilton, clerk
> 1 (513) 542-3555