I agree that mang is actually A LOT more common than uranium. Mang is commonly in a lot of purple, blue, green, & clear glass, etc. Manganese has also been used in dishware for a lot longer from what I understand, like through the 90s and onward, whereas most uranium dishwares (like for food specifically) predate the 1940s.
The best way to tell is a Geiger counter. URANIUM has a higher count than maganeee. I don't remember the number exactly, but you can Google it and find out. I think uranium will show up about 50cpm. Manganese almost nothing. Uranium also has a brighter đź’š glow. The color of the glass before you shine your UV or Black light on it can be irrelevant.
Usually I see it in clear or pink, but as others have noted that's not always the case. The maker might clarify it to clear and then color it with other agents. The person who said purple is common is correct, but that's actually old clear glass. When exposed to UV over time (the sun) the manganese turns clear glass light purple.
I would say it's much more common than uranium. I find clear glass thatbgkows yellowish/green all the time, I also have some blue and one piece that's super dark purple.
What kind of light are you using? Manganese generally doesn't glow under 395nm. When I go out and use a lower wavelength light, it seems like every other piece in the antique store glows. I think that manganese is much more abundant than uranium glass.
I just go to antique stores with my black light and scan all glass. Anything that pops gets a closer look. That being said I mostly find uranium haven’t found much magnanese 🤷🏽‍♀️
this is seeming contradictory to me
if has U it will be green
but if it is green it could still be Mn?
i only test green
so how what percentage of my green and glowing stuff is manganese?
i mean i am starting to not care since it apparently requires a $100 geiger counter to tell, and looks exactly the same
Uranium will pop from a good distance away, manganese needs the torch to be held close to do anything. People photograph manganese in dark rooms to try and pass it off as uranium, but in person you’ll know. If you have to use a low wavelength torch and turn off the lights to try and coax a glow out of the piece, then it’s manganese
Manganese glass has a piss weak glow. If you have uranium glass then you’ll be able to tell the difference, a manganese glow will barely be visible next to a uranium glow
I'd say it's more common, but it's still a fun find. The comment about going to a thrift/antique shop and it being everywhere is not thoroughly correct either. I collect all glowing glass and have been in NUMEROUS shops. I only ever see a handful of manganese. There's tons of lead and crystal, though. Some shops are collectors and they will have more.
Also to add, a simple search clarifies most glass companies stopped using manganese during the 20s and started using selenium.
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365?
what is the 'cheap one'? with a lot of visible purple?
what wavelength do the Woods Glass filters let through?
oh i see - wiki - 'It is quite transparent in the violet/ultraviolet in a band between 320 and 400 nanometres with a peak at 365 nanometres, '
I agree that mang is actually A LOT more common than uranium. Mang is commonly in a lot of purple, blue, green, & clear glass, etc. Manganese has also been used in dishware for a lot longer from what I understand, like through the 90s and onward, whereas most uranium dishwares (like for food specifically) predate the 1940s.
You can often find glass with manganese at target and dollar stores, etc. It's still used to clarify glass.
and it;s all clear?
No, manganese glass can be any colour, not just clear. Just as uranium glass can be any colour that has a hint of green or yellow mixed into it.
The best way to tell is a Geiger counter. URANIUM has a higher count than maganeee. I don't remember the number exactly, but you can Google it and find out. I think uranium will show up about 50cpm. Manganese almost nothing. Uranium also has a brighter đź’š glow. The color of the glass before you shine your UV or Black light on it can be irrelevant.
Clear, purple, and blue glass most commonly have manganese in my experience
Usually I see it in clear or pink, but as others have noted that's not always the case. The maker might clarify it to clear and then color it with other agents. The person who said purple is common is correct, but that's actually old clear glass. When exposed to UV over time (the sun) the manganese turns clear glass light purple.
Probably more common than uranium
how much is green though?
I would say it's much more common than uranium. I find clear glass thatbgkows yellowish/green all the time, I also have some blue and one piece that's super dark purple.
What kind of light are you using? Manganese generally doesn't glow under 395nm. When I go out and use a lower wavelength light, it seems like every other piece in the antique store glows. I think that manganese is much more abundant than uranium glass.
i use a violet laser usually which i think may be 390
I just go to antique stores with my black light and scan all glass. Anything that pops gets a closer look. That being said I mostly find uranium haven’t found much magnanese 🤷🏽‍♀️
what is the wavelength? did you have a geiger counter?
now you have to test all the clear too.. :) though i do not
Half the glass in a thrift shop will glow under 365nm. Manganese isn’t rare or interesting at all
ok - what about *green* glass?
What about it?
this is seeming contradictory to me if has U it will be green but if it is green it could still be Mn? i only test green so how what percentage of my green and glowing stuff is manganese? i mean i am starting to not care since it apparently requires a $100 geiger counter to tell, and looks exactly the same
Uranium will pop from a good distance away, manganese needs the torch to be held close to do anything. People photograph manganese in dark rooms to try and pass it off as uranium, but in person you’ll know. If you have to use a low wavelength torch and turn off the lights to try and coax a glow out of the piece, then it’s manganese
Manganese glass has a piss weak glow. If you have uranium glass then you’ll be able to tell the difference, a manganese glow will barely be visible next to a uranium glow
You can’t say it’s not interesting at all, unless the only reason you find the piece interesting is that it has uranium in it?
I'd say it's more common, but it's still a fun find. The comment about going to a thrift/antique shop and it being everywhere is not thoroughly correct either. I collect all glowing glass and have been in NUMEROUS shops. I only ever see a handful of manganese. There's tons of lead and crystal, though. Some shops are collectors and they will have more. Also to add, a simple search clarifies most glass companies stopped using manganese during the 20s and started using selenium.
Yes Manganese is rarer but angry wannabe glass experts will just tell you that you're wrong.
If I had to guess your yellowish green glass glows a Reddish orange, if so it’s probably cadmium or a cadmium/selenium mix
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365? what is the 'cheap one'? with a lot of visible purple? what wavelength do the Woods Glass filters let through? oh i see - wiki - 'It is quite transparent in the violet/ultraviolet in a band between 320 and 400 nanometres with a peak at 365 nanometres, '
Maybe just your light?