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More minerals

Fluorescence
10 replies to this topic

#1 Hornblende

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Posted 05 May 2019 - 14:17

Hello all,
I have been away for a long time due to my studies but I am slowly going back on cool mineral fluorescence photography :smile:
Below is a picture of leucophanite crystals (a kind of beryllium silicate) fluorescing under UV-long wave. In visible light they are rather boring, colorless to creamy yellow, which contrast with there bright-pink fluorescence!

I still have some problem with dust specs and fluorescence of the background material. I need to find a non-fluorescent, very black paint.

Canon 6D – El Nikkor 80mm f5.6 – Baader UV/IR cut – Convoy S2 w/ filtered with a baader U Venus filter
ISO 400 – 8 seconds exposure – f22
Attached Image: IMG_0983 copie.jpg

#2 Shane

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Posted 06 May 2019 - 05:13

I used to use Industrial Krylon 1602 Ultra Flat Black for most of my UV, IR and fluorescence work. It even worked well for covering the internal surface of a light blocking cover that was placed over gem materials being measured on an Ocean Optic integrating sphere.

Edited by Shane, 06 May 2019 - 05:17.


#3 Cadmium

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Posted 06 May 2019 - 05:47

Ooo... that is very pretty!
Yes, I learned about the 1602 from Shane years ago, works great.
It is possible Lee has one of the background materials that will work, I have not tested those yet.

#4 Hornblende

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Posted 06 May 2019 - 16:50

Thanks guys,
I will try this paint!

#5 Andy Perrin

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Posted 06 May 2019 - 16:54

Hornblende, I think Jonathan also mentioned that the Stuart Semple Black 2.0 worked in vis through UV nicely.

#6 Harald

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Posted 22 February 2020 - 18:31

Hi there,
I've just ordered Stuart Semple Black 2.0.
Will make a black box for photographing UV minerals. Thanks Andy :D

#7 nfoto

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Posted 23 February 2020 - 07:33

The Semple really *is* black even under UV. No fluorescence as far as I can ascertain.

The problem with backgrounds -- and specimens themselves - usually are caused by deposits of lint. I don't think those problems ever can be completely circumvented.

#8 dabateman

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Posted 23 February 2020 - 07:46

Yes I also use Semple Black 2. Version 3 wasn't out yet when I bought version 2.
Both are really good. Jonathan also tested version 3.
It doesn't look black to me under visible light. But it is from a reflection point of view. So with a camera its black.

#9 Andy Perrin

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Posted 23 February 2020 - 17:16

Quote

It doesn't look black to me under visible light. But it is from a reflection point of view. So with a camera its black.
You need a microscopically rough surface to get rid of the reflections. People have tried a lot of things, including nanotubes (vantablack) to roughen the surface. I don't think an acrylic paint can replicate that. What we really need is UV polarizers that cost a reasonable amount...

Edited by Andy Perrin, 23 February 2020 - 17:16.


#10 Andrea B.

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Posted 27 February 2020 - 08:38

Very pretty mineral specimen under UV!
Andrea G. Blum
Often found hanging out with flowers & bees.

#11 Harald

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Posted 04 October 2020 - 10:47

Just ordered Stuart Semple Black 3.0 to make a black box
150ml for 14.99£

https://culturehustl...llections/black