Abstract: In the fabrication of an ink jet nozzle structure for ink jet printing, photoform glass is initially exposed in the general configuration of the ink chambers and nozzles desired to be formed in the glass. Thin transverse lines are left unexposed across the desired transition point between the ink chamber and the nozzle, and across a transition between ink inlet and the chamber. The ink chamber is desired to be of greater depth than either the inlet area or the nozzle, so two-step acid etching is used. The nozzle and the inlet are masked, as by taping, during a portion of the acid etching and unmasked during another portion, so that the chamber (which is never masked) is etched deeper than the inlet and nozzle areas.