The reflective display device of the invention includes: a display layer; an optical element placed on an observer side of the display layer; and a reflection element placed on a side of the display layer opposite to the observer side. This electrochemical etching solution supplies to the material on the substrate surface the species to form an intermediate compound on the surface that can be more easily mechanically removed as intermediate compound fragments than the material. Inter-process communication blocks may be defined that describe the connectivity of functional blocks in the deployed version of the model.