That means green is stronger in the edge than other part. But, I recommend to use black light to determine if its is real uranium glass. Green in the sun light, and glows bluish-green under UV. This is NOT uranium glass, but maybe, potash potassium glass. This glass is radio-active, due to the potassium K activity. K is radio-active having 12 billion half year, and included 0. This is NOT uranium glass.
You may see many items which say "Blue vaseline" in the auctions. So, please be careful when you buy them. Most of the clear blue glass are NOT uranium glass. Manganese shows either green or orange fluorescence under UV light. In the bottom picture under UV, you will see green glass in the back. It is real vaseline in order to compare the bluish-green one in front. I bought these items at one-dollar shop in Japan.
Greenish blue uranium glass. If it is inhaled or swallowed, radium is dangerous because there is no shielding inside the body. If radium is ingested or inhaled, the radiation emitted by the radionuclide can interact with cells and damage them.
During the production of radium dials, many workers who painted clock or instrument dials with radium developed cancer. To create fine tips on their paint brushes for small surfaces, many radium dial painters licked the bristles of their paintbrushes. In doing this, they often swallowed some of the radioactive paint.
In the body, radium acts similar to calcium, so the radium that workers ingested was deposited into their bones.
Many of these workers developed bone cancer, usually in their jaws. Eventually, scientists and medical professionals realized that these workers' illnesses were being caused by internal contamination from the radium they ingested. By the s, radium was no longer used on watch and clock dials.
Uranium crystalline glaze on earthenware. Source: Smithsonian Institution. Before the s, many companies used radionuclides to color glazes. The most commonly used radionuclides were uranium, thorium, and potassium. These glazes can be found on floor and wall tiles, pottery and other ceramics. Some Fiestaware produced before used depleted uranium to create the color of the glaze. Learn more about Depleted Uranium. This image of a vaseline-glass cup can glow under a black light.
Vaseline glass is a recent term that probably dates from the s. Uranium glass, an older and more general term, is sometimes used as a synonym for Vaseline glass, but this can lead to confusion because some types of glass colored with uranium e.
Canary glass is an even older name that was first used in the s to describe what is now referred to as Vaseline glass. Some transparent yellow or yellow-green glass has been colored using additives other than uranium e.
To confuse matters somewhat, this non-Vaseline glass might even be radioactive due to the presence of thorium impurities! Perhaps the most reliable way to identify the presence of uranium in the glass is to expose it in the dark to a source of ultraviolet light e. If the glass glows a rich green color, it contains uranium. This green fluorescence explains why an example of Vaseline glass that looks yellow under incandescent lighting might take on a greenish tinge when viewed outdoors.
There are exceptions. Some uranium-containing glass does not fluoresce under ultraviolet light, e. An analysis indicates that all the pictured items contain natural uranium except the tube on the right which contains depleted uranium.
Some uranium glass is still made overseas. You can identify Vaseline glass primarily by its color and whether it can glow under a black light. Vaseline glass collectors have popularized a saying regarding the glass: "If it doesn't glow green, it's not Vaseline. There are a couple of other types of antique glass that people confuse with Vaseline glass. One of these is depression glass, which was popular around the same time period as Vaseline glass, and many of the same companies manufactured it.
It can often be mistaken for Vaseline glass because it tends to be translucent and can have a green or yellow tint to it. However, it is only considered Vaseline glass if it has the distinctive yellowish to yellow-green coloration. Depression glass came in an extensive array of colors like red, pink, purple, blue, white and black. Custard glass is another type of yellow glass that was popular during the same time period.
It also is made with uranium and will glow under an ultraviolet light. However, custard glass has an opaque rather than translucent appearance. It also has a "fire test" that collectors can use to identify it. If a piece of custard glass is held up to light, a reddish opalescence sheen should appear.
This does not happen with Vaseline glass, so it's a good way to tell the two apart. The condition of the piece is very important, with scratches, chips, and repairs having a negative effect on value.
Older items tend to be more valuable than newer pieces, all other factors being equal. Additionally, rare pieces, such as those with multiple colors of glass or featuring unique and interesting designs, can fetch much more than average. The best way to know if a piece of Vaseline glass is valuable is to look at the recent sales prices for similar items. Here are some sample values for Vaseline glass pieces:.
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