> I got the info second-hand, so can't say as eye witness, but I was told
> they were screened negatives. 
How does one make a screened negative? I have tried to find halftone 
screens at graphic supply companies but keep getting the answer that no 
one uses screens any more because "everything" is now done via computer. 
I also tried getting Kodak autoscreen film but was told by at least one 
major Kodak distributor that it had not been made for the last ten years 
(despite what some recent alt photo manuals has said, but that's another 
story). Does anyone know where halftone screens can be purchased and is 
is worth doing?
Larry Shapiro