Taking Bath Bombs into the classroom

Making bath bombs fits perfectly into both the Science and Technology Curriculum. What a great way for children to develop their own bath bomb recipe - what is the best mixture of sodium bicarbonate and citric acid to make the best fizz? How can this be measured? This would also bring in fair-testing.  I'm sure dropping a bath bomb into a bowl of water and asking 'What happened?' would provoke a lot of classroom discussion. Where did the idea of bath bombs come from?

Statistics can be brought into their learning as well. What is the best smell for making bath bombs? Is this different for girls and boys? They can then work out the total cost to make their bath bombs and the amount they'd have to sell them for to make a profit.

Children can develop designs for packaging and marketing of their bath bombs.

This would be a cool way to hook children into Science!