In reply to:

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You get a transparent one from DarkStar ...

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If I could get hold of some anti-reflective colourless plastic about 1.5mm thick then I would have done this. However I haven't found any yet so at the moment It's just plain old inkjet transparency film. I use CorelDraw to make the screens. I find that two passes through the printer gives a good saturation of colour. With one pass it looks a bit wishy-washy. If you want the file it's here.