The more intense the UV the brighter the green glow and the less that the original yellow colouring can be seen. This is due to the Ultra Violet radiation exciting the outer electrons of the uranium atoms which as a result give off energy and is seen by our eyes as a bright green glow. The other significant aspect is that it glows a vivid bright green under Ultra Violet light (blacklight). We are reliably informed though that as the radioactivity is at a very low level it is quite safe. This Vaseline Glass Image is Copyright © 2003 Tony Hayter (1st.Glass) One of the most significant aspects of uranium glass is that it is radioactive and does give a positive reading on a Geiger counter. Production of uranium glass in Britain ceased by the end of the second world war but a small amount is still being manufactured in the USA and Czechoslovakia. There is no doubt though, that in 1835 experiments with uranium as a glass colorant were being carried out by Whitefriars Glass Works in London and that in 1836, a pair of uranium glass candlesticks were presented to the Queen. Some others consider that its first use was by Josef Riedel at his Bohemian glassworks in the 1830's. There have been claims that its first use was as early as 79 AD following the discovery in 1912 of a glass mosaic in an excavation on a Roman Villa near Naples in Italy but this has never been proven. So it's easy to understand why it has been added to glass as a yellow colourant since the early 19th century. Make It Glow or check it out for imperfections VASELINE GLASS / URANIUM GLASS - WHAT IS IT ? This Vaseline Glass Image is Copyright © 2003 Tony Hayter (1st.Glass) AN EXPLANATION OF WHAT VASELINE GLASS / URANIUM GLASS IS AND WHY IT GLOWS UNDER UV LIGHT This Vaseline Glass Image is Copyright © 2003 Tony Hayter (1st.Glass) Uranium salts (Uranium Dioxide), as found in their natural state, are a vivid yellow. PORTABLE UV BLACK LIGHT SECURITY MARK, STAIN, URINE DETECTOR and more Black lights An essential tool for collectors, buyers and Sellers 4W UV BLACK LIGHT Essential Tool For Glass Collectors - Resellers / Valuers etc. MONEY, DETECTOR, Uranium Glass Torch Free Batteries incl.
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