Question

Most red writing inks are a dilute solution of the red dye:
(A) Triphenylmethane
(B) Methylene blue
(C) Basic fuchsin
(D) eosin

Answer 1

Hint To solve this question, first we have to understand each and every option. The pigments are insoluble whereas the dyes are soluble.

Complete step by step solution:
The pigments present in ink are both organic and inorganic, most of the red inks are a dilute solution of the red dye known as erosion. The blue colour ink can be obtained by the substituted triphenylmethane dyes. And there are many other permanent writing inks which contain iron sulfate and the gallic and tannic acids as well as dyes.

Hence, the correct answer is option (D) i.e. Most red writing inks are a dilute solution of the red dye eosin.

Additional information:
The dye which is present in the fountain pen ink can be separated by the process of chromatography. Chromatography separates the chemical mixtures of proteins or different chemicals into various different components on the basis of difference in their speed. The mixtures are separated when the mixture is distributed between the two phases known as mobile phase and stationary phase. If we talk about the effect of polarity on chromatography, polarity has a huge effect on how much a chemical substance is to other substances.

Note: During chromatography do not get confused between the partition technique and the adsorption technique. The partition technique is used for the separation in liquid-liquid substances and on the other hand adsorption technique is used in the separation of the solid-liquid substances.