How can be obtain coloured component from blue or black ink?

To obtain colored components from blue or black ink, you can use a process called chromatography. This involves dissolving the ink in a small amount of water or alcohol and then applying it to a chromatography paper. As the solvent travels up the paper, the different pigments in the ink will separate based on their solubility and affinity for the paper, revealing various colors. This method effectively isolates the individual colored components present in the ink.