But before I even got to that subject I was intrigued by the way the screened on "label" looked under the various types of epi illumination. I thought others might find it interesting as well. So the first three shots are of the printed back surface of the CD (all taken at 50X on sensor).
The first is epi-DIC.
Second is brightfield (with crossed polarizers)
Third is epi-darkfield.
I had broken apart the CD and scraped some of the pieces with a razor in order to gain access to the layer that contained the data. This next image shows a part where the layers broke off, but some still adhered to the underlying surface. First is the painted plastic rear surface (on the left). Then there appears to be the reflective layer (but it actually appears clear here
), then below that is the layer that (I think!) is the actual data layer. This was with brightfield and crossed polarizers. 
Finally I found a nice clean section, and got the epi-darkfield image of the data pits and lands. (This was 200X on Canon 50D sensor... 80X objective and 2.5X NFK photoeyepiece)
