I have looked at the back of the stamp with a light source facing the front, and the only black markings that I can see are from where the stamp has been marked on the front during the stamping process.
Clear, cool water and allow it soak; chances are the excess paper will float off by itself. It may need to a bit of 'persuasion', but be careful since the wet stamp will be soft and tear easily. After soaking, place face down on a paper towel if you do not have a drying book. Don
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