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1.
“The Tyndall effect in opalescent glass: it appears blue from the side, but orange light shines through.” Wikipedia, “Tyndall Scattering”; https://www.flickr.com/photos/50206319@N00/112909824
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Exhibitors Herald, Better Theatres Supplement, November 27, 1926. Rick Zimmerman collection.
Black Hills Weekly (Deadwood, South Dakota), Thursday, November 26, 1924, page 3
Tampa Tribune, Friday, February 9, 1912, page 1
