Unetched
Unetched is an adjective describing a material surface or region that has not undergone an etching process. Etching refers to the deliberate removal of material by chemical or mechanical means to reveal underlying microstructure, composition, or patterns. An unetched surface therefore preserves the original microstructure and surface morphology prior to any etching step.
In metallography and materials science, etching exposes grain boundaries and phases; an unetched specimen will not
In microfabrication, unetched regions are areas not exposed to etchants during pattern transfer; they remain pristine
Preparation and reporting: when presenting results, it is important to indicate whether a sample is unetched,