Topic: Some questions regarding UV glow of Uranium- and other glass

[dirk.]

I´ve made a similar observation. The Skrdlovice clear glass does indeed have a strong
manganese glow, but also I´m sure they did use uranium. Here´s my example:
https://picasaweb.google.com/108140812446658939096/Skrdlovice#5589252175805496130
BTW are there any other decolorants being used in glass-making? My Gralglas pieces
e.g. glow quite orange-ish under UV. 

[Lustrousstone]

If it's orangish green, than that's probably still manganese. I suspect it depends what else is in the glass.

The stand back and shine is probably a good pointer, though it doesn't always work quite so well with irridised pieces or with some of the non-transparent uranium colours

[rocco]

I have the same vase as Dirk in the same colourway, and the green layer glows strong like the ones in my other Skrdlovice pieces, so I would think they contain Uranium...

And funnily I observed the strong orange glow in my >> Gral glas bubbly vase as well.
And a totally spooky greenish/turquoise glow came from some of my blue and teal coloured Czech glass pieces.
All very interesting

Michael

[glassobsessed]

Re your sommerso jug Christine, I have two, one has a G Hardy label and is red and uranium sommerso, no doubt it is uranium as it glows brightly in daylight with a little UV key ring light. The clear outer layer on both reacts as for manganese, one might make a good comparison photo...

Meanwhile, both these bits of Skrdlovice glow merrily in daylight with a bit of UV. The knobbly bowl has a thin layer of uranium glass 'sandwiched' in the middle.

John

[Ohio]

I´ve made a similar observation. The Skrdlovice clear glass does indeed have a strong
manganese glow, but also I´m sure they did use uranium. Here´s my example:
https://picasaweb.google.com/108140812446658939096/Skrdlovice#5589252175805496130
BTW are there any other decolorants being used in glass-making? My Gralglas pieces
e.g. glow quite orange-ish under UV. 

Manganese Dioxide wil produce the orange glow. I've found this particular URL to be helpful.  Ken

http://1st-glass.1st-things.com/articles/glasscolouring.html

[rocco]

Thanks all! (And Ohio for the link, interesting reading)
So Managanese does produce a green to orange glow doesn't make things easier...

I would now think that the green glass in my Skrdlovice pieces in my first pic does contain Uranium.
The clear glass in the vase in my second pic and the fish could have Manganese glow.

With the tall vase in my 4th pic I am quite sure it is Uranium, too -- not the slightes yellowish hue, and the green glow under UV was obvious in daylight as well...

(My pics are not really convincing I know -- I photographed with the camera in one hand and the UV torch in the other )

Michael

[dirk.]

Thank you, Ken! That makes sense - I used to have a trinket set, which had both colours under
UV at the same time - greenish orange or orange-ish green...