Question

How can be obtain coloured component dye from blue and black ink

Answer 1

Put a watch glass on the mouth of the beaker as shown in the given figure. Put few drops of ink on the watch glass. Now start heating the beaker. We do not want to heat the ink directly. You will see that evaporation is taking place from the watch glass. Continue heating as the evaporation goes on and stop heating when you do not see any further change on the watch glass.
Now we will observe that the water get evaporated from the watch glass and residue is left in the watch glass. This residue is the coloured component (Dye). In this way evaporation can used to obtain volatile component from its solution.