you mean degraded transformer oil or dielectric fluid? 
http://en.wikipedia.org/wiki/Transformer_oil_testing

>
Good morning all,
>
> I am doing some background research on residues you get from transformers
> and toroid components in an IC extraction.  Unfortunately, I don't know
> much about how such components are manufactured or the materials used.  Do
> any of  you know of a good tutorial or overview on such
> materials/processes
> that is available on the Net?
>
> Doug Pauls
> Principal Materials and Process Engineer
> Rockwell Collins
>
>
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