Chemical tests

Get an adult to make up the household soda solution, as it is highly caustic. When making up the solutions wear rubber gloves and take care not to get the solutions on your skin or clothes.

* Take care when doing these tests.
* Use ‘Milton’ (available from a chemist) or the cheapest supermarket bleach without additives.
* Carry a small amount in a clearly labelled leak proof dropper bottle.
* Avoid contact with skin and clothing.
* Read the manufacturers safety warnings on the bottle prior to use.