Erupting Volcano Experiment - Dinosaur Land's natural disaster

Today, I came through on my promise to the boys to get the volcano we put in Dinosaur Land to erupt.

I found a similar experiment in a book we have called 100 Science Experiments for Kids.

What we needed;

• The volcano we made (a 500ml plastic bottle - I think it may have been Oasis, with silver foil crunched to make a volcano shape around it and some hessian/burlap type material loosely wrapped around the foil - to look like rocky form)
• a baking tray on newspaper (we had to take the volcano out of dinosaur land to ensure we could survive the mess)
• 250ml vinegar (we used pickling vinegar)
• a squirt of washing up liquid
• a squirt of red food colouring
• a generous heaped teaspoon of bicarb (the book suggested wrapping this in a small square of tissue - but we found this didn't work that well - maybe because we used kitchen roll and it was too thick?)
• Some dinosaurs for effect.

You put the volcano on the baking tray,  fill the volcano with the liquids and mix.

Then add the bicarbonate of soda and stand back! Great fun