Is there a residue on the watch glass?
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Explanation:
The residue left on the watch glass is the solute, dye. Due to heating of the ink the water, solvent in the ink got evaporated leaving behind the dye, the solute.
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The residue left on the watch glass is the solute, dye. Due to heating of the ink the water, solvent in the ink got evaporated leaving behind the dye, the solute.
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