Black ink is typically a mixture of several different coloured dyes. Chromatography is a technique used to separate components of a mixture based on their differential partitioning between a stationary phase and a mobile phase. Different dyes in the ink travel at different rates through the stationary phase (like paper), causing them to separate.
The dye in black ink can be separated by the method of:
Asked in UPSC Geoscientist 2020 · Topic: Physical and Chemical Changes, Solution (Distinguishing Solutions, Colloids, and Suspensions)
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