Question

The most commonly used acid in Etching process is:

• A. Hydrogen Oxide
• B. Hydrogen Peroxide
• C. Hydrochloric Acid
• D. Nitric Acid

Hint:

While various mordants can be used for etching, \textbf{Nitric Acid} is the classic, traditional choice taught in many printmaking studios for etching copper and zinc plates.

Answer 1

The Correct Option is D

Step 1: Identify the function of acid in etching. Its purpose is to corrode or "bite" the metal plate where it has been exposed by the etching needle.
Step 2: Evaluate the chemical options.

Hydrogen Oxide is the chemical name for water (H\(_2\)O), which does not etch metal.
Hydrogen Peroxide is an oxidizer but not the primary acid used for biting plates.
Hydrochloric Acid can be used, but it is less common and can produce hazardous fumes.
Nitric Acid (HNO\(_3\)) has historically been the most common and traditional mordant (etching acid) for copper and zinc plates. Another common alternative is Ferric Chloride, but among the choices given, Nitric Acid is the standard answer.