b Separate by distillation Put 10 mL ink in a flat bottom conical flask Add boiling chips to prevent bumping Fit a stopper with a delivery tube reaching half way down a collecting testtube or an Utube in a beaker of water Heat the ink with a Bunsen burner flame Drops of a colourless liquid appear in the collecting tube Identify the liquid as water by its action of turning white anhydrous copper sulphate to blue hydrated copper sulphate Do not allow ink to froth up or splash into the delivery tube