1 - 2 tsp bicarbonate of soda
2 tsp vinegar
You can also add a drop of washing up liquid and red food colouring if you wish.
To make your volcano, please make sure you have an adult present.
Add the bicarbonate of soda to the volcano base.
Mix the vineger with the washing up liquid and food colouring (if using) and pour over the bicarbonate of soda.
Stand back and watch your volcano erupt!