Coating on older DEC slides

Rod Smallwood rodsmallwood52 at
Sat Jun 13 14:52:04 CDT 2015

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

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