I've posted this question here as premiere is the only place that I can find any reference to Green & Blue Screens. Years ago I worked at TV centre for the BBC and they were experimenting with something called CSO - Colour Separation Overlay which I think is the same thing. Premiere also talks about Chroma Key which I also think is similar. If so

1. What, if any, is the difference between blue & green screen?

2. Is any particular shade of blue or green necessary ?

3. Which, if any, is the better option ?

4. How important is lighting ?

5. Will a piece of material purchased from my local fabric store suffice ?

Thanks Guys