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Vintage Marbles Glow Brilliantly Under Blacklight Thanks To What?



 Uranium glass marbles glowing in front of a UV flashlight
Daniel Cascaddan / Wikimedia

Answer: Uranium

Many vintage marbles have a curious property that delights kids and adults alike: if you shine a black light ( or another source of intense ultraviolet light) on them, they fluoresce an absolutely brilliant green color.

Why do some vintage marbles shine brilliantly and some simply react to the presence of the black light like any other glass? The secret is the composition of the glass: many vintage marbles manufactured with uranium infused glass. When illuminated by ultraviolet light, the glass shines an intense (and stereotypically "radioactive") green.

But why would anyone add uranium, however small the amount, to glass marbles? It seems like when you consider that back in the 1

920s, nobody was walking around with a pocket black light to make their marbles glow – so the novel appearance of marbles in such a situation would not have been a consideration.

The selling point wasn't the glow (which is something enjoyed by modern collectors), but much more subtle coloration. Uranium infused glass, commonly called "Vaseline glass" by collectors because of its slightly cloudy appearance, takes on a special appearance when exposed to even the smaller concentration of ultraviolet light rained down upon us by the sun. Uranium infused glass vases, bowls, prisms, and glass by panels took on a beautiful almost opalescent quality when sunlight hit them just right. Although the green tint was by far the most common, other variations include yellow and blue.

Uranium glass usage fell out of favor during the late 1930s and 1940s as the United States government snapped up all available uranium for nuclear research, development and weapons construction purposes. Today, small handful of marble companies make small runs of marbles with uranium glass, and even smaller numbers of glass artisans still craft vases, bowls, and decorative objects with the curious glass. If you're worried about the safety of uranium glass trinkets, don't worry. While some rare pieces have higher than normal amounts of uranium content, the vast majority of uranium glass is considered negligibly radioactive and requires very sensitive equipment to detect its radioactivity. [Function] (f, b, e, v, n, t, p) {if (f.fbq) return; n = f.fbq = function () {n.callMethod? n.callMethod.apply (n, arguments): n.queue.push (arguments)}; if ( ! f._fbq) f._fbq = n; n = n.push; n.loaded =! 0; n.version = '2.0'; n.queue = []t = b.createElement (e): t .async =! 0; t.src = v; p = b.getElementsByTagName (e) [0]; s.parentNode.insertBefore (t, p)} (window, document, 'script', 'https: // Connect .facebook.net / en_US / fbevents.js'); FBQ ( 'init', '335401813750447'); FBQ ( 'track', 'Page View');
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