![]() Vaseline glass, or Canary Glass, is a yellow-green glass mainly produced for tableware and household items from around 1840 up until World War II. Fortunately, the amounts used to make uranium glass are tiny. Yes, the same uranium used for bombs and nuclear power reactors. ![]() There are several types of glass that were made with uranium in them. Uranium is the most common ingredient in UV glass. ![]() The colors of the glass and the UV glow depend on the chemicals used to create the glass. There are several types of UV glass that were mass produced and most likely are the source of the UV sea glass that you might find. Shine a black light on your paper that’s been highlighted, and you’ll see the same brilliant effect as shining a light on UV glass. The glow is similar to that of a highlighter pen, which looks brighter than a plain yellow pen when even just a little bit of UV light hits it. If you look at a piece of UV glass sitting in the sun as dusk falls, you might even catch a faint glow. They did not necessarily know or care that the materials would glow under black light.Įven without black light, UV glass sometimes has a subtle glow even when there’s only a little bit of sunlight. ![]() Glass manufacturers included fluorescent materials in UV glass to create certain decorative colors, such as bright green Vaseline glass, or make glass that was highly visible, such as the bright red glass used in tail lights. Scientifically, fluorescence is caused by substances in the glass absorbing invisible ultraviolet light and then releasing the energy as visible light and heat. These are known as fluorescent or ultraviolet glass, or simply UV glass. If you shine a black light on them, they will glow a bright green, orange, red, purple, or yellow color. Mixed in with all the regular pieces of sea glass we find on beaches around the world, there are sometimes pieces that were made with fluorescent materials. While every piece of beach glass is special, something magical happens when you find a piece that glows. ![]()
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