Direct Positive Paper - How Does It Work?

Ray;

I think I said what you just posted, in my post. I just did it with fewer words. There is much more modern information, probably in patents as I have stated earlier.

PE

Knowledge is not theory.

richard ide said:

Knowledge is not theory.

Click to expand...

Maybe.

Still, I get the impression a lot of "knowledge" is just theory in disguise.
But, if I undestood your point, I agree the gap in photography between industy and theory was pretty deep.

Perhaps it was only colory theory that was at the head of the arrow?