How do we obtain the components of dye from blue/black ink?
Answers
Answer:
Evaporation is a useful method to obtain coloured component (dye) from blue/black ink. Ink is a colloidal solution - a heterogeneous mixture of dye and water. When this mixture is heated, water evaporates and dye is left out.
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Answer:
By Chromatography.
Explanation:
Chromatography is a method to seperate 2 or more components present in a substance. The method is as follows:
1) Take a thin strip of filter paper.
2) Draw a line on it using a pencil approx. 3 cm above the lower edge.
3) Put a small drop of ink with help of a pen at centre of line and let it dry.
4) Lower the filter paper into a glass jar containing water in such a way that the ink’s drop remains just above the water level. Leave it undisturbed.
5) Water rises up in the filter paper. Ink drop splits up into its constituents.
Conclusion: Dye in black ink is a mixture of 2 or 3 colours. The coloured component that is more soluble in the water rises faster and in this way, the colours get separated.
To identify the dye, we need to calculate the Rf value which is (Distance moved by solute) / (Distance moved by solvent).
Every dye has a unique Rf value.