Julian,
A great introduction to spectroscopy....cheap as chips!
In Tonkin's "Practical Amateur Spectroscopy", p57, David Randell contributes a whole chapter on CD/DVD "spectroscopes"
When you get "bitten" by spectroscopy and want to move up the food chain towards astronomical spectroscopy you'll find the readily available Star Analyser gratings (100 and 200 l/mm) provide a great introduction and allow you to develop processing skills needed as you more forward.
Onwards and Upwards!
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