Which of the following acid is used in Ink?
Correct answer: D. Tannic
- A. Valeric
- B. Acetic
- C. Formic
- D. Tannic
Explanation
Tannic acid is used in traditional ink formulations, especially iron-gall ink, where it reacts with iron salts to produce a dark pigment. Acetic, formic, and valeric acids have different household and industrial uses.
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