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Googling does suggest that silver oxide and silver nanoparticles will fluorescence under UV in certain conditions. I couldn't say why.I took images of a 1947 Australian Florin coin under fluorescent, short wave and long wave UV lighting.
What I find puzzling is why the coin should fluoresce in the first place.
The coin has a composition of 50% silver, 40% copper, 5% nickel, 5% zinc.
The coin probably has a tarnish but why this should fluoresce at 254 nm is a mystery to me.
The blue specks in the 365 nm image are due to microfiber contamination.
Any suggestions to what is going on?
No other coins I have imaged exhibit fluorescence.
Perhaps the coin was used at some rave party where people were using some UV flourescent makeup .. or maybe even it was @sjastro's pre-rave makeup which contaminated the sample(?)
Some more interesting info.
There is something odd about Australian coins under shortwave UV.
What's even more mysterious is a 2000 year old Roman denarius produced in the reign of the emperor Trajan.
That is odd. I can only assume that like everything else in Australia, it's trying to kill you, and this is how you can tell it's as venomous as a platypus spur.
I think that looks a bit more like Hadrian's profile, Trajan's cousin and successor. The CAESAR TRAIAN is in a similar spot as yours, but the legend runs off the edge. I suspect it would be followed by HADRIANVS.
So, Wiki says that particular Aus shilling's composition should be:There is something odd about Australian coins under shortwave UV.
.. and I don't think many made their way through the Christmas pudding cooking process either .. (Threepences were a different story though ..)50.0‰ silver, 40‰ copper, 5‰ nickel, 5‰ zinc
Its fraud .. or just fake news!According to the Certificate of Authenticity it's Trajan.
On the certificate the full detail of Trajan's name is revealed.
Just think of it as, 'the more UV reflected, the cleaner the surface'As an off topic human interest story for those that have an obsessive compulsive disorder with cleanliness do not purchase, I repeat do not purchase a longwave UV torch.
Even a reasonably looking clean wall under ordinary lighting conditions is going to be a nightmare scenario under longwave UV.
I'd hate to see what my skin looks like under UV then ..As an off topic human interest story for those that have an obsessive compulsive disorder with cleanliness do not purchase, I repeat do not purchase a longwave UV torch.
Even a reasonably looking clean wall under ordinary lighting conditions is going to be a nightmare scenario under longwave UV.
Or the second deadliest land snake the Eastern Brown.
I live in rural Australia and these critters reside under the concrete slab and come out to warm up on the veranda.
I need to be very careful when entering or existing the house...........
Gumboots?Remind me to buy some shoes.
I purchased a pair of "snake proof" boots from the US a few years ago only to find they are not terribly useful as protection against the Eastern Brown.Gumboots?
(Mind you, I've never tested them to see if a fang can penetrate the rubber ..)
If I may slightly misquote Neville Flynn from Snakes on a Plane: "I have had it with this <expletive deleted> snake on my <expletive deleted> boot!"I purchased a pair of "snake proof" boots from the US a few years ago only to find they are not terribly useful as protection against the Eastern Brown.
The boots extend to just below the knee while the vast majority of Eastern Brown bites occur to the thigh region as the snake strikes from a high vertical position.
The saving grace for me in my frequent unintentional encounters with the Eastern Brown over the years is that they don't appear to be aggressive.
On one occasion I was slashing the grass around the property when I noticed a tail sticking out of the long grass. I thought it the tail of a blue tongue lizard.
I gave it a tap with my boot as I didn't want to injure or kill it; the tail turned out to being an Eastern Brown which then wrapped itself around my boot.
It took a few seconds to extract the snake in a kicking action but once it was air borne it probably would have made it in the Guinness Book of Records for the longest flight taken by a snake.
I suspect the snake was more in a state of shock than I was.
I purchased a pair of "snake proof" boots from the US a few years ago only to find they are not terribly useful as protection against the Eastern Brown.
The boots extend to just below the knee while the vast majority of Eastern Brown bites occur to the thigh region as the snake strikes from a high vertical position.
The saving grace for me in my frequent unintentional encounters with the Eastern Brown over the years is that they don't appear to be aggressive.
On one occasion I was slashing the grass around the property when I noticed a tail sticking out of the long grass. I thought it the tail of a blue tongue lizard.
I gave it a tap with my boot as I didn't want to injure or kill it; the tail turned out to being an Eastern Brown which then wrapped itself around my boot.
It took a few seconds to extract the snake in a kicking action but once it was air borne it probably would have made it in the Guinness Book of Records for the longest flight taken by a snake.
I suspect the snake was more in a state of shock than I was.
No shoes on?This broke me up. It reminded me of the times I've come close to crapping myself after almost standing on a snake or a big goanna or a bull ant nest - usually with no shoes on.
OB
Its interesting that when the snake has a go at him, what you say is right .. the snake is heading for his thigh just above the knee. (I did a frame-by-frame on the YouTube). I might have to rethink my defence strategy there ..No shoes on?
You must must have a death wish.
I found this video of a snake catcher handing an Eastern Brown like a strand of spaghetti, it made me cringe.
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