6th May 2005 at 01:00
KS 3-4

Place some coloured crystals under microscopes. Illuminate them through a Polaroid filter to show further colours. Look out for compounds of iron (red), copper (blue) or nickel (green), and yellow sulphur (does this give a clue to the name Yellowstone?).

Simple chromatography of green plant pigment might help show the browns and yellows of carotenoids. Crush leaves or grass and mix with some ethanol (caution: it's flammable), which is best warmed by in a test-tube placed in a beaker of hot water. Filter out the green solution and stand a piece of chalk in a few millilitres of the solution in a container and cover in Cling Film. See the solution rise and the colours separate into bands of green, brown, orange and yellow.

Subscribe to get access to the content on this page.

If you are already a Tes/ Tes Scotland subscriber please log in with your username or email address to get full access to our back issues, CPD library and membership plus page.

Not a subscriber? Find out more about our subscription offers.
Subscribe now
Existing subscriber?
Enter subscription number


The guide by your side – ensuring you are always up to date with the latest in education.

Get Tes magazine online and delivered to your door. Stay up to date with the latest research, teacher innovation and insight, plus classroom tips and techniques with a Tes magazine subscription.
With a Tes magazine subscription you get exclusive access to our CPD library. Including our New Teachers’ special for NQTS, Ed Tech, How to Get a Job, Trip Planner, Ed Biz Special and all Tes back issues.

Subscribe now