Coating on older DEC slides

[COURYHOUSE at aol.com]

cadmium not  good  for  you... beryllium is  even  worse!
 
Ed#
 
 
In a message dated 6/13/2015 12:51:52 P.M. US Mountain Standard Time,  
rodsmallwood52 at btinternet.com writes:

It might  be cadmium


On 13/06/2015 16:45, John Wilson wrote:
> On Sat,  Jun 13, 2015 at 11:20:19AM -0400, Noel Chiappa wrote:
>> So, what  _is_ that grey coating - and, more important, how (if at all) 
can  it
>> be reproduced these days?
> Wild guess:  some kind  of oxide?  I agree that it doesn't look like paint
> or powder  coat.
>
> John Wilson
> D  Bit