This is a series of investigations based around the Briggs-Rauscher oscillating reaction to look at antioxidant levels in fruits and teas (though the method can be adapted for any source antioxidant).
The reaction mixture cycles from blue through yellow to clear and back to blue again. The change to blue is very sudden – like the 'iodine clock'.
Original LTS/ES materials
Antioxidants - Pupil Guide
Antioxidants - Teacher's Guide
Media items - A list of some media items providing background on antioxidants. It was originally produced by LTS but is not now on the Education Scotland website.
Link to SSERC Antioxidants activity
Contains guides for teachers, pupils and technicians as well as risk assessments and some background materials as well.