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Agate that has been 'colour treated', UV, VIS & both.

Fluorescence
5 replies to this topic

#1 colinbm

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Posted 06 November 2020 - 12:47

With some here showing beads & minerals, I decided to find some for myself.
I have a local bead shop & fortunately a mineral display visited my local Mall.
So armed the 'Wanfire' 365nm UV torch I ventured to these two outlets & spooked them with my UV expedition.
By-the-way one of the no name UV torches has the brand as 'Wanfire', on eBay.
The lady in the bead shop had never seen anything like it before, but only 1% of the glass & plastic beads were UV fluorescent.
The mineral display was equally scarce with UV fluorescence, but I did get some nice examples that I could afford.
The lady with the minerals was impressed with the 'Wanfire' & ordered one online. I did explain that they weren't 15w but still the best around.

So here is the first posting by me in a long while......this is an Agate that has been 'colour treated'...?
Not exactly sure what they do to the stone but I gather it has had some heat treatment to change its colours ?

I took photos of the 'colour treated' Agate with three different wavelengths.
First is in Visible light from a 6000k white LED.
Second is in UVIVF from the 'Wanfire' 365nm LED torch.
Third is a combination of UVIVF + Visible light.

Attached Image: FP000078 Agate colour treated VIS crop sharpen.jpg

Attached Image: FP000079 Agate colour treated 365nm UVIVF crop sharpen.jpg

Attached Image: FP000084 Agate colour treated UVIVF + VIS crop sharpen.jpg

#2 dabateman

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Posted 06 November 2020 - 14:38

Its a way in which you polish the stone, if I can remember correctly.
I used to tumble and polish stones as a kid. Look up Cat's eye stones. These aren't real, just a good polish to make it look that way.

Probably cost too much to move my old Rock collection from Canada here to were I live now. But most likely I would have some treasures. I collected all across Canada during childhood camping trips.

#3 Stefano

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Posted 06 November 2020 - 14:57

You can enhance the color of a gemstone with heat or exposure to ionizing radiation.

https://www.google.c...d=1604674589336

https://www.google.c...d=1604674447571

#4 colinbm

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Posted 07 November 2020 - 00:54

View PostStefano, on 06 November 2020 - 14:57, said:

You can enhance the color of a gemstone with heat or exposure to ionizing radiation.

https://www.google.c...d=1604674589336

https://www.google.c...d=1604674447571

Thanks Stefano, amazing processes.

#5 enricosavazzi

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Posted 19 November 2020 - 12:22

Are you sure it is agate and not a piece of a thick seashell?
-- Enrico Savazzi

#6 colinbm

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Posted 19 November 2020 - 13:05

Thanks Enrico
This business of heat & dye treating minerals is all new to me, but especially in the last two images I can see the Agate properties coming out...?
I did a Mohs Test & I was just able to scratch glass.
Col