Combine Bi-Carb Soda and boiling water and stir until Bi-Carb Soda has completely dissolved. Allow to cool slightly.
Place glue in a disposable bowl or container. Add coloring and mix to combine.
Pour Bi-Carb Soda mixture into the glue mixture and stir until a blob forms. Scoop up the slime with your hands, squeeze out as much liquid as possible and knead until smooth and dry.