That might work for what eyes see, but not otherwise.
For example, a cotton pad with an ink solvent could strip off the recent layer of ink.
Fancier equipment could form 3-D images where layers could be looked at individually.
Chemicals could effect different inks in different ways. Unless the printed ink is identical to the ink on the roller there's probably a way separate them.
Fancier equipment could form 3-D images where layers could be looked at individually.
Chemicals could effect different inks in different ways. Unless the printed ink is identical to the ink on the roller there's probably a way separate them.