everyday science MCQ #2334

Which of the following acids is used in ink?

everyday science MCQ #2334

  1. Question 1

    Q1. Which of the following acids is used in ink?

    • A) Tannic acid
    • B) Formic acid
    • C) Acetic acid
    • D) Valeric acid

    Answer: Tannic acid

    Explanation: Tannic acid (tannin) is used in making certain inks, particularly iron gall ink, where it reacts with iron sulfate to produce a dark pigment.