Loris,sorry that I just realized I should make selection according to the way you made it in your attachment.
10-drop strip: step 1,2,3,4,5 turn to black simultaneously.But the K value of step 6(85%) is the same as step 1,2,3,4,5.So the Dmax is supposed to be step 6?
8-drop strip: step 1,2 turn to black in order.But the K value of both is the same(87%).So the Dmax is supposed to be step 2?
It's so puzzling.Why are they so different? The drops are for an coated area of 4x5 inches and both of the strips are from the same piece of paper.