Appearance
The normal colour of uranium glass ranges from yellow to green depending on the oxidation state and concentration of the metal ions, although this may be altered by the addition of other elements as glass colourants. Uranium glass also fluoresces bright green under ultraviolet light and can register above background radiation on a sufficiently sensitive Geiger counter, although most pieces of uranium glass are considered to be harmless and only negligibly radioactive.
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Modern uranium glass beads (white background)
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Modern uranium glass beads (black background)
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Modern uranium glass beads (UV light)
Read more about this topic: Uranium Glass
Famous quotes containing the word appearance:
“The fear of death is indeed the pretence of wisdom, and not real wisdom, being the appearance of knowing the unknown.”
—Plato (c. 427–347 B.C.)
“Do not look on his appearance or on the height of his stature, because I have rejected him; for the LORD does not see as mortals see; they look on the outward appearance, but the LORD looks on the heart.”
—Bible: Hebrew, 1 Samuel 16:7.
“You speak of poverty and dependence. Who are poor and dependent? Who are rich and independent? When was it that men agreed to respect the appearance and not the reality?”
—Henry David Thoreau (1817–1862)