Dear Rockey: I'm sure you will get lots of advice on this subject.
Try this: Close the rollers of the mill on the sheet of silver you
will be using hard enough to make an impression. Note the thickness
setting and loosen the rollers enough to pull out the sheet. Then
close the rollers about five thousandths thinner than your original
setting. Place the leaf (or whatever else you might want to make an
impression with) on the sheet and roll thru the mill in one smooth
The leaf will be dust, but the impression should be quite clear.
Often things that one might not want, like hair and lint will leave
the clearest impressions in a sheet.
Have fun with this,