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Dye in Black Ink a Single Colour

VSAT 2023

Separation of Dye From Ink: An Introduction

Last updated date: 01st Feb 2023
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Ink is a complex mixture. The major components of ink are solvents, waxes, resins, alcohol, lubricants, carbon, pigments, dyes, aniline, dextrine, glycerine, fluorescents, and other chemicals.

The coloured component or dye can be separated from black ink by evaporation and chromatography. If water is taken in a beaker and a watch glass containing ink is placed over the beaker. The beaker is then heated, and eventually, the water in the ink will be evaporated, leaving the dye behind.

Black ink is made by mixing together several different coloured pigments. This blend of pigments may be separated using paper chromatography, allowing us to identify the colours that go into each marker. As a stationary phase in this process, porous material, similar to filter paper, is utilised. The mobile phase can be water or another solvent, such as acetone or alcohol.


What is Chromatography? Explain the Process

Chromatography is a method for separating a mixture's components, or solutes, based on how evenly each solute is dispersed between a stationary phase adjacent to the mobile phase. Usually, one phase is hydrophilic, and the other is lipophilic. The components of the mixture interact in a different pattern with these two phases. The factor on which the interaction depends is the polarity of the components. At a particular time known as the retention time, each sample component elutes from the stationary phase.

A chromatogram is created by recording and plotting the signal of the components as they move past the detector. Chromatographic techniques are mainly used in the purification of proteins of industrial importance. The different types of chromatography are:

  1. Adsorption Chromatography

Depending on the component's absorptivity, various chemicals are adsorbed to varying degrees on the adsorbent during the process. Components with greater absorptivities travel farther.

  1. Thin Layer Chromatography

Using a glass plate covered with silica gel, the mixture of chemicals is separated into its constituent parts in this method. The various parts of the mixture are subsequently carried to various heights by the solvent/mobile phase.

c. Column Chromatography

This process separates the components of a mixture using a column packed with suitable adsorbent. The component having the highest absorptivity is retained at the top, while the other is separated to different heights accordingly.

  1. Partition Chromatography and Explanation of the Process

A continuous differential partitioning of mixture components into a stationary phase and a mobile phase occurs in this process. Paper chromatography is a good illustration of partition chromatography. The stationary phase in this procedure is chromatography paper, which is suspended in a combination of solvents acting as the mobile phase. The mixture to be separated is placed at an area at the bottom of the chromatographic paper using a capillary tube. The paper should be submerged in the mobile phase to detect chromatogram development.

As the solvent rises up the paper, the components are carried to varying degrees depending on how well they adhere to the paper. As a result, the components are divided at various heights. Following the development of the chromatogram, the paper is dried using an air drier. Additionally, to identify the sample chromatogram spots, the detecting solution can be sprayed on the paper with a produced chromatogram and dried.


Chromatography of Black Ink

The stationary phase and mobile phase are the two components of chromatography. As the name implies, the stationary phase is still and immobile. The phase that passes over the stationary phase is known as the mobile phase. Paper chromatography is used to separate the many colours in black ink. The mobile phase is assumed to be water. The various pigments of black ink continue to separate as the water rises. Some pigments are reported to dissolve rapidly in water and are pulled with the water to a greater distance.


Black Ink in Water

The pigment colours are carried away by the water as it is mixed with black ink. Some colours dissolve more easily in water and move up the paper along with the water. Separating the components of a mixture so that you can see each one separately is referred to as chromatography. After chromatography, the black ink truly has a rainbow-like appearance!


Interesting Facts

  • Separating mixtures is done using chromatography. The name itself translates to "colour writing." Chromatography can separate colours such that you can see the individual components of each colour.

  • Pigments, resins, waxes, and additives are ink's main components.

Key Features

  • Chromatography is used for separating the components of coloured mixtures.

  • The ratio of the solute's and the solvent's travel distances is known as the Rf (retardation factor) value. The term is derived from chromatography, where it was found that a particular component will always travel a specific distance in a specific solvent under a specific set of circumstances.

Competitive Exams after 12th Science

FAQs on Dye in Black Ink a Single Colour

1. What is differential extraction?

The method of separating an organic component in an aqueous solution is known as differential extraction.

2. What are the different types of dyes?

The different types of dyes are acid dyes, basic dyes, synthetic dyes, pigment, mordant, naphthol, pre-metallized, azo, aniline, and anthraquinone dyes.

3. What is ion exchange chromatography?

In this chromatography, the molecules separate according to their surface charge along the column packed with cross-linked polystyrene resins. Examples of resins include DEAE cellulose and CM cellulose.

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