To do this experiment you'll need to raid the
cupboards first to find these ingredients:
Bicarbonate of soda
Put the cabbage leaves in a bowl and pour the hot water over
them, stir and leave for a few minutes. This should give you
a blue liquid (at least if you are doing this in Norfolk it
should, in other places it might be red).
Now let's try putting some different
stuff into the cabbage juice to see what happens. Try the
lemon juice first.
Pour a little lemon juice into the red cabbage juice and give
it a shake. What do you think will happen?