Скачать или смотреть For The Want Of A Nail...

Sign up for the free Grand Illusions newsletter, at http://conta.cc/3dplns1
_______________________________________________________________________

To make the red cabbage water that Tim uses in this demonstration, you will need a red cabbage. Take the outer leaves, which normally you would probably discard, chop them up a bit and put them into water. Bring the water to the boil, and then reduce the heat to a simmer, for about an hour. You can then strain the water, to remove the pieces of cabbage, and then simmer it a bit more to reduce the volume and make it a bit more concentrated.

Red cabbage water behaves a bit like litmus paper - it is red or pink when it is acid, and turns blue/green when it becomes alkali.

Tim's demo involves a 12 volt battery, although it should work perfectly well with a 6 volt battery.

When the tip of the nail touches the paper, electrolysis is occurring and the liquid becomes alkaline. This causes the red cabbage water to turn green. Magic!