Yesterday, I found what looked like an encoded message in a Brandon Sanderson fantasy novel that said "angel" and "EMI." EMI was a British movie studio, so I looked at what special effects could be used to cause people to appear like they glow, i.e., angelic.
There are compounds called "scintillators" that glow under the right wavelengths. Long ago, when I was college-aged, I went to the Manti Temple pageant staged outdoors by the Manti temple in Utah. It told about the Book of Mormon and had some impressive special effects when it came to angels; the actors playing angels really did seem to shine in the stagelights. Sadly, the pageant no longer is held.
One of the top British science fiction movies is The Man in the White Suit (1951), which stars Alec Guinness (the original Obi-Wan Kenobi) as a man in a super-white suit that can't be stained. I wonder whether there was some scintillator use in his white suit, for I remember watching the film and thinking that his suit practically glowed in comparison with its surroundings.
If someone wanted to pretend to be an angel, especially if they wanted to fool a member of the Church of Jesus Christ of Latter-day Saints, using scintillators would be an obvious thing to do. Here is one description of angels that most Latter-day Saints would recognize:
I discovered a light appearing in my room, which continued to increase until the room was lighter than at noonday, when immediately a personage appeared at my bedside, standing in the air, for his feet did not touch the floor....He had on a loose robe of most exquisite whiteness. It was a whiteness beyond anything earthly I had ever seen; nor do I believe that any earthly thing could be made to appear so exceedingly white and brilliant. His hands were naked, and his arms also, a little above the wrist; so, also, were his feet naked, as were his legs, a little above the ankles. His head and neck were also bare. I could discover that he had no other clothing on but this robe, as it was open, so that I could see into his bosom....Not only was his robe exceedingly white, but his whole person was glorious beyond description, and his countenance truly like lightning. The room was exceedingly light, but not so very bright as immediately around his person.
Joseph Smith History 1:30-32.
I hope Latter-day Saints are aware that even angelic visitations can be faked with the right special effects. (And shaking a fake angel's hand wouldn't tell you anything--see Doctrine and Covenants 129--because live humans can shake hands, too. I'd watch out for the ones doing "special" handshakes, especially.)
