Question

Red ink is prepared from:
A. Aniline
B. Eosin
C. Phenol
D. Congo red

Answer 1

Hint: This dye is most commonly used dye which is used to stain the cytoplasm in histology, cytoplasm is the thick solution by which the cells are filled. So, the dye which is our answer to this question is a bright pink color dye material having very complex structure and which is not found naturally but it is produced from xanthene.

Complete answer:
The question is all about the red dye which you will find in dairy products, candies mainly all the sweet items and also used for preparing cakes and chewing gums. Now the question is what the source of red dye is, let’s start discussing this.
Dyes are the organic compounds used because of their color imparting nature to paper, textile and leather etc. As we see above ,dyes can also be used in food coloring. Red ink is prepared from eosin it is a sodium salt having name as \[2,4,5,7 - \text{Tetrabromofluorescein}\] let’s also see its structure.

Here, as you can see, there are four bromine atoms connected with carbon at positions \[2,4,5\,and7\] . Now the other options are Congo red it is also an organic compound but it is not used to make red ink though it is also a red colour dye.

Hence, option B is correct.

Note: There are certain characteristics of dyes like some dyes are acidic in nature while some are basic. Also some dyes can be used because of their color in most of the work you have heard about the dye which is present in red wine, jellies that you eat and also milkshakes. These all are food flavoring dyes. The eosin is also used as food pigments in many items.