ถึง weird_chris :It looks more like green paint on a wooden panel. As he said, specially prepared wooden panel. Yup, with green paint. Otherwise it is as you stated.
Takes me back 50 years when they used to advertise x-ray specs in many magazines, supposed to be able to see under girls clothes. I never bought any but I know they didn't actually work, I think it was just some sort of illusion.
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