Bath Bomb

IMG_3635After a morning of experimenting with stalagmites and stalactites (from Whizz Pop Bang magazine) Lil D’s appetite for science was not fully satisfied. We are still making our way through the various craft kits Lil D got at Christmas, so this bath bomb studio was the obvious next step in our afternoon of science.


All the ingredients were included: bicarbonate of soda, cornstarch, acid, red colouring, a mould, goggles, pipette, beaker and gloves.  The instructions were clear.  It all looked promising.

Lil D prepared herself, Bear read out the step by step instructions.  After combining all the powders and colour the idea was to put the mix into the mould, tap it down and build a sphere that could hold itself together.  Except, the amount of water added didn’t really hold the powder together and when the mould was opened (after prolonged tapping down from Lil D) it all inevitably fell apart.  Adding more water didn’t help, and when we got the point of fizzing (as a good bath bomb should) we had to admit defeat.

But our little scientist didn’t despair.  Lil D pointed out that she knew how to make a volcano from bicarbonate of soda… wouldn’t it be fun to add some red colouring to that and make a volcano?  A second set of instructions in the kit pointed out a similar use for the ingredients, so it was all go for lava time! And we even got to compare the two methods.

Lil D’s recipe for lava (no quantities provided- but then again she is 8 years old):

Bicarbonate of Soda


Food colouring

The results:

A slow gush of foam from both methods, but a decidedly more vinegary smell after Lil D’s!!

Science rocks!!


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