How can you prove that dye in a black ink is a mixture of many colors?

By evaporation

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By sedimentation

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By chromatography

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All of the above

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Solution

The correct option is A By chromatography
Ink is a mixture of dye in water and it can be proved by evaporation. The fact that dye is a mixture of many colours can be proven by chromatography.
Black ink that we normally use contains water as a solvent. By chromatography, we can see that the coloured component which is more soluble in water rises faster, and in this way, colours get separated.
Hence, option $C$ is correct.

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Similar questions

When evaporation of ink is carried out, water evaporates from the ink leaving behind the solid dye component in the evaporating dish. This proves that:

Q. Evaporation is useful method to obtain coloured component (dye) from blue/black ink. Ink is a ________.

Q. Seperation of dye from blue/black ink via evaporation is:

Q. While doing chromatography using black ink, the results seen is/are:

(a) black ink is a mixture of red, green, and blue colours.

(b) ink is a mixture of dye and water.

Q. The rate of evaporation of water from the liquid ink decreases as _______ during the extraction of dye from blue or black ink.

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