skjos: You undertook a tremendous amount of work (hassle) which has now provided this forum with valuable information. It deserves every one of the stars now appended to your post.

It'll benefit a lot of folks - me being among them as I've wondered time and again, "What kind of media?"

And who would've imagined the aluminium oxide having such a pronounced contrast range?

You've spared me a huge amount of work and, more importantly, a screw-up, followed by another, and another, and . . .

Thank you, Sir!

DC