Hi ARSC,

I'm writing to see if any of you have information about historical lacquer 
formulas used to make instantaneous discs in the 1930s-1950s.

At NEDCC we're trying to develop conservation treatments for delaminating 
discs, but we need some more background info about the chemistry of the 
lacquer to make sure there are no surprise reactions.

From Pickett & Lemcoe and Paton et al. (1997) I understand that it's 
nitrocellulose lacquer plasticized with castor oil. Contemporary sources 
mention that other resins, lubricants, dyes and solvents may have been added 
as well, but I can't find out what these were, or in what proportions.

If any of you have historical formulations or chemical analyses of the 
lacquer, or know somebody I should get in contact with, I'd appreciate it.

Thanks!
Mason