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#26

goldierocks
Member
Joined: 10 January 2015
Posts: 3,100
Member
08 November 2020 10:03 am

sand surfer wrote:
Brumble-Gum wrote:

I just read this.
Platypus fur fluoresces too!

https://www.sciencealert.com/the-austra … nt-fur/amp

Well bugger me Brumble-Gum ,if i am on the locos next year and go to a certain area, i might take the UV torch and have a look ,there is a creek we cross that has platypus in it, on full moon nights if i am out that way i park on the bridge and have crib and watch them play perfect

Sounds like a hard life.....only worry if you start baying.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

1 user likes this post: sand surfer

#27

Manpa
Member
From: Sheidow Park, SA
Joined: 06 January 2018
Posts: 3,680
Member
07 December 2020 07:38 pm

I know this technically shouldn’t be in this section but they do fluoresce under uv.

https://www.abc.net.au/news/2020-12-07/ … t/12957148


One of these days Ma!

4 users like this post: Rockhunter62, sand surfer, LoneWolf, BigWave

#28

Dr Lex Winter
Banned
Joined: 13 January 2021
Posts: 20
Banned
13 January 2021 09:46 pm

2lateagain wrote:

LW, most of the radioactive glass that we own came from my mother and they were always on display in my parents house for as long as I can remember, we were not aware of what it was until we got one of the UV lights about 8 years ago, my wife liked them when she saw them a long time ago and they became hers when my parents passed.

I have always wondered why I glowed in the dark, always thought it was the clean living and being a really nice person was the reason, but looks like I was badly mistaken as I have been told by a lot of people. lol lol lol

Graham

Just don't eat it or grind it up and inhale the powder and you should be right.

Although I know it's tempting. Radioactive things taste amazing. sad

#29

Sstein
Member
Joined: 15 January 2021
Posts: 15
Member
20 January 2021 08:39 pm

BigWave wrote:

I thought I'd start this to show interesting stuff fluorescing under UV lamps.
Not just minerals, but our currency has some great anti-counterfeit effects using UV lights:
Can you see the bird on our $5 notes (and check out my ciggy lighter handle):
https://www.prospectingaustralia.com.au … 5_note.jpg
Can you see the manufacture date and serial number:
https://www.prospectingaustralia.com.au … note_1.jpg
Can you see scorpions in the bush at night? They glow like light houses at 10m using a Convoy S2+ UVA torch. They're everywhere in the Vic GT. In your tent?
https://www.prospectingaustralia.com.au … rpions.jpg
Then check out ladies' UV nail polish, real rubies (glow a brilliant red - not fakes), diamonds (50% glow blue), lichens in rain forests - all sorts of colours.
Hundreds of other things glow when exposed to UV light that you can't see when only illuminated with visible light.
Tonic water glows faint blue, dog/cat piss (well - maybe you don't want to know - don't check your carpets or sofas where they sit).
Also, don't use a UV torch in your hotel room at night - particularly the dunny - well - you really really don't want to know.
No wonder these lights are used by forensics staff.

You have gotten me curious now. These torches, where can they be purchased?

#30

BigWave
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From: Melbourne
Joined: 19 January 2016
Posts: 4,350
Member
21 January 2021 01:32 am

Check the net for Convoy S2+ with the 365nm Nichia LED.


GPX-4500 & Direction Finding Daughter

#31

Dihusky
Member
From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 1,336
Member
21 January 2021 02:38 pm

BigWave wrote:

Check the net for Convoy S2+ with the 365nm Nichia LED.

thumbsup Top little torches.

#32

goldierocks
Member
Joined: 10 January 2015
Posts: 3,100
Member
21 January 2021 05:08 pm

BigWave wrote:

Check the net for Convoy S2+ with the 365nm Nichia LED.

My reservation about any of these is that some fluorescent minerals won't fluoresce at their 365 nm wavelength. For example, 60% of opals fluoresce and UV can be used noodling, but that would not be likely to work with these (need short wave UV - must use goggles). Also I suspect that their intensity is poor (so I would go for the 6W version not the 4W, although still weak). I suspect filters may not be desirable because it would possibly reduce the UV further despite getting rid of much visible light. But good fun when starting out, and a relatively safe wavelength.
http://www.galleries.com/minerals/prope … l.htm#long

Unfortunately short wavelength lamps are much more expensive (e.g. this one is both). Unfortunately it is only 4W so needs to be used under very dark conditions.

https://prospectors.com.au/collections/ … t-included

By the time you get to 8W and 25W they are many hundreds of dollars and mainly mains voltage (good for display cabinets not the field).

I did find this battery-operated model with both long and short wavelength uv bulbs - but still only 4W. I am surprised at their lousy photos though, so would ask around first.

https://www.ebay.com.au/i/253204188059? … d3d0daac31

http://vi.raptor.ebaydesc.com/ws/eBayIS … 9000&ver=0

There are also cheap short-wave only battery 4W. I am just concerned that their poor photos might indicate that they give out a fair bit of light in the visible spectrum

Remember, uv goggles ALWAYS with short wave UV (they are very cheap)

Any comments?

Last edited by goldierocks (21 January 2021 05:30 pm)


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#33

goldierocks
Member
Joined: 10 January 2015
Posts: 3,100
Member
21 January 2021 05:55 pm

Rated wattage is not everything - see this comparison:

https://www.ultravioletphotography.com/ … entry10923

The convoy S2+ performed better than the best of these (191.7 mW/sq cm) - it is generally sold with a filter which given its good output is probably worth having. So yes, probably a great beginner lamp...will keep most people happy unless they get really serious and go for short wave as well


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#34

Dihusky
Member
From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 1,336
Member
22 January 2021 03:21 pm

It's all horses for courses, getting scientific is one thing, but a short wave torch is very handy when checking gem rough, night fossicking in old Tin mining dumps for Topaz, palming and running over a tray of Garnet rough to see if a Ruby has been missed or discovering the Rubies aren't. The list goes on...

For collectors and photographers of Fluorescent minerals higher grade lighting will be the go-to but difficult to carry in the field. Our little Convoys have found us some great material and it's a lot of fun discovering other things that fluoresce that you don't expect.

1 user likes this post: BigWave

#35

goldierocks
Member
Joined: 10 January 2015
Posts: 3,100
Member
22 January 2021 03:40 pm

Dihusky wrote:

It's all horses for courses, getting scientific is one thing, but a short wave torch is very handy when checking gem rough, night fossicking in old Tin mining dumps for Topaz, palming and running over a tray of Garnet rough to see if a Ruby has been missed or discovering the Rubies aren't. The list goes on...

For collectors and photographers of Fluorescent minerals higher grade lighting will be the go-to but difficult to carry in the field. Our little Convoys have found us some great material and it's a lot of fun discovering other things that fluoresce that you don't expect.

I agree, although any torch with greater output and less visible light will give you clearer, brighter colours (and the Convoy S2+ is all of that according to reviews). The reason I mentioned short wave is not only the additional minerals that fluoresce, but its greater potential for noodling opal dumps.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#36

UnderEmployedGeo
Member
Joined: 31 December 2020
Posts: 52
Member
22 January 2021 11:07 pm

Just bought a UV torch and have been making "interesting" discoveries ever since! ops


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