A printing method comprising: providing a substrate having a surface coated with a coating comprising at least 25% silica; and printing on the coated surface with an ink comprising pigmented polymer particles and a carrier liquid. The gas bubbles are generated in situ in a uniformly distributed way at the base of the liquid bath. A depth-first tree traversal protocol algorithm, including commands and symbols, is used to more efficiently interrogate a plurality of transponders in a short amount of time. A lever member is in contact with the latch in the engaging state, and excessively oscillates the latch in the direction of a closing operation, by which the engaging state between the latch and the ratchet is released during the time from the opening operation of the operating handle to the disengaging operation of the ratchet.