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John Noakes demonstrates some of the mind-boggling visual effects that have been made possible using the Colour-Separation Overlay (CSO) technique. Marvel as Peter Purves loses his head and bounces John Noakes' noggin like a basketball - all while Patch the Blue Peter dog does his best to spoil the illusion.
Only the BBC calls it Colour Separation Overlay, by the way - feel free to call it chroma key or blue screen / green screen like the rest of the world.
Originally broadcast 28 September, 1970.
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