Q. Which of the following is an ingrain dye?
A) Congo-red
B) Aniline black
C) Alizarin
D) Indigo
Explanation
(b)
(i) Congo red is direct dye.
(ii) Alizarin is anthraquinone dye.
(iii) Aniline black is an ingrain dye. The last process of dyeing is done on fabric for such dyes.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.