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Science2Life online is now stocking this amazing colour changing bubble bath. It contains a dye called bromocresol green which is used by scientists as a pH indicator. Bromocresol green is yellow when the pH of a solution is less than 3.8; green for pH values between 3.8 - 5.4 and blue for solutions with a pH greater than 5.4.
Citric acid has a pH of 2.2 - it has been added to the soap solution and this is what gives the bubble bath its orange colouring.
Tap water has a pH of between 6.5 - 8.5. It's pH is therefore larger than 5.4 so the bubble bath turns blue when it is added to bath water.
This video shows you how to make a colour changing bath bomb experience.

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