You will need rubber moulds for this project, ice cube ones work well.

Crush down the baking soda with a mortar and pestle and then place it in a separate bowl.

Pour the witch hazel, lemon juice, food colouring and aromatherapy oils in to a spray bottle.

Spray the soda until the mixture starts to stick together.

Compact in to the moulds.

Press the bombs out on to a plate and leave to dry for a few hours.