The Talking Machine Forum — For All Antique Phonographs & Recordings

It is currently Tue Sep 19, 2017 7:45 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 13 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Ambient temperature and playing records
PostPosted: Wed Aug 30, 2017 4:18 pm 
Offline
Auxetophone
User avatar
TMF Administrator
Joined: Wed Jan 14, 2009 6:01 am
Posts: 1874
Location: Ferndale, MI
bfinan11 wrote:
Does anyone know what color these formulas would have been without the dyes? Assuming it wasn't black, when did black become the standard, and why?


I'm guessing a relatively unappealing brown color....


Top
 Profile  
 
 Post subject: Re: Ambient temperature and playing records
PostPosted: Wed Aug 30, 2017 4:51 pm 
Offline
Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 233
Location: Philadelphia, PA
bfinan11 wrote:
Does anyone know what color these formulas would have been without the dyes? Assuming it wasn't black, when did black become the standard, and why?


The filler material was clay from the South (I forget where) and Pennsylvania. It was mostly bentonite, which is the clay used in most kitty litter. This is a similar color to Perfect, Vocalion and the other orange/brown discs of the era. This is the natural color of the material. From what I've read, 2% carbon was added to make the discs black.
Why? Probably because the coloant was cheap and it had a nice shine.


Top
 Profile  
 
 Post subject: Re: Ambient temperature and playing records
PostPosted: Wed Aug 30, 2017 5:46 pm 
Offline
Victor III
User avatar
Joined: Wed Feb 22, 2012 10:03 am
Posts: 561
Location: near Utopia, UK
Many other fillers appear to have been used in various formulations, including other clays (e.g. china clay), calcium carbonate (whiting, rottenstone etc) and even ground slate by some manufacturers! Also sometimes other materials that whilst increasing strength must have contributed to noise - like floc and cotton waste. Carbon black, as well as acting as a pigment, is also a powerful structural filler, even in relatively small quantities.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ]  Go to page Previous  1, 2

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Americanized by Maël Soucaze.