Why do we heat the ink drops on the watch glass instead of heating it directly ?

Dear student ,

The purpose of taking ink on watch glass is because we do not want to heat ink directly. If it is heated directly then we will not be able to get the solid residue.Solid will also decompose if ink is heated directly so the purpose of separation will not be fulfilled. Thus ink is taken in a watch glass which is kept over a beaker containing water . Beaker is heated so that ink is indirectly heated.  

Regards

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