What thickness is he normal paper for this stamp? (ACSC doesn't mention it for this issue.) Of my 3 copies, the outer two measure 0.088mm thick, which is a bit more than the 0.075mm for the normal stamp. The middle copy is just a tad thicker on average.
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.75mm is not the thickness for a normal stamp, it is the thickness of the thin paper type. .88mm is still thin paper, and as the ink saturates the thin paper it will give a darker shade.
Unfortunately I do not have a Deep Slate, hopefully I will soon remedy that.