One 1 dm
Magnetic stirrer and follower (ideally one coated in Teflon)
Tweezers or tongs
Breakfast cereal with added iron such as 'Special K'
Measure about 50g (or one serving) of cereal into the beaker. Crush
the cereal by hand and add about 500 cm
Stir the mixture using the magnetic stirrer and follower for a few
minutes. Remove the follower using the tweezers.
A small but noticeable amount of iron powder will be seen sticking
The amount of iron is small, so it will be necessary to pass the
follower around the audience, in a plastic weighing boat for example.
In the following footage, the iron is difficult to detect, but
can be seen as the black substance on the follower.