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Think Your Hands are Clean ?


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#1 colinbm

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Posted 18 October 2014 - 12:50

So you think your hands are clean.....
I had washed my hands a few times this afternoon & had dinner, now eight hours later the message is still there !
VIS light induced IR Fluorescence has revealed a note I wrote on my hand eight hours earlier & I can't see a trace of ink on my palm.
https://www.flickr.c...06/14942320994/
Col

EDITOR: I've added the photo here - and given Col more posting space (see message below).
Flickr links don't always seem to work well for some reason.

Attached Image: 14942320994_bb3db066d3_c.jpg

#2 nfoto

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Posted 18 October 2014 - 14:07

Only seeing a login page?

#3 JCDowdy

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Posted 18 October 2014 - 14:10

Very good!
This obviously deserves to be posted in the UV Forensics section.
Please show us corresponding Vis & UV images.
Thanks

#4 colinbm

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Posted 18 October 2014 - 14:19

Is this any different....... https://www.flickr.c...s/54724528@N06/

#5 colinbm

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Posted 18 October 2014 - 14:21

Thanks John
It is bedtime for me, downunder, so I'll try again tomorrow.
Col

Edited by colinbm, 19 October 2014 - 11:50.


#6 Andrea B.

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Posted 18 October 2014 - 16:41

Col, I added you to the Members+ group so that you have more posting space.
We are happy to do that for anyone else who has reached the initial posting limit.
Andrea G. Blum
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#7 colinbm

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Posted 18 October 2014 - 22:29

Thanks very much Andrea

#8 colinbm

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Posted 19 October 2014 - 12:00

HI everyone
The latest sequence of the grubby mits in IR Fluoro.
I wrote on my hand in blue biro at 10:20am, then the first washing, 11 hours later at 9:30pm, after further washing I took the Visible induced IR Fluorescence shot of my hand & lastly the bare hand in VIS light, showing no visible biro ink to my eye.
Cheers
Col
Attached Image: SDIM6042 VIS first biro inking web.jpg

Attached Image: SDIM6043 VIS first clean web.jpg

Attached Image: SDIM6045 VIS induced IR Fluoro 11 hrs later web.jpg

Attached Image: SDIM6047 VIS 11 hours later web.jpg

#9 nfoto

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Posted 19 October 2014 - 12:27

To complete the task, do snap a shot in IR of the hand as well.

#10 colinbm

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Posted 19 October 2014 - 12:51

I'll do it now Bjorn
Col

My now famous hand in IR light, the same filters on the camera as before, 720-780nm. The light source the same 24watt Mercury vapor HID flashlight, this time unfiltered.
Cheers
Col

Attached Image: SDIM6049 IR 720-780 web.jpg

Edited by colinbm, 19 October 2014 - 13:14.


#11 nfoto

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Posted 19 October 2014 - 13:36

Thanks, that was helpful indeed. The fluorescence appears much more likely.

#12 colinbm

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Posted 19 October 2014 - 13:49

Thanks Bjorn :D
Col

#13 colinbm

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Posted 20 October 2014 - 08:48

I promise this will be the last of my paw......unless by popular demand, I am requested to return :D
20 32 hours later the biro ink is still readable on my hand, in Visible Light induced Infrared Fluorescence.
Cheers
Col

Attached Image: SDIM6056 VIS induced IR Fluoro 20 hrs later web.jpg

Edited by colinbm, 20 October 2014 - 11:17.


#14 Timber

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Posted 20 October 2014 - 09:08

Nice hands Colin, I see a great fortune and prosperity in your future! But beware as not everything is gold that shines! <- isn't it what all the fortune tellers say all the time? :D

Have you tried different inks? It would be interesting to find out if all inks act like this or only certain type.

Ps.: It's fun to see you use biro for ballpen... Biro means Judge in hungarian, and it was the family name of the inventor Laszlo Biro (Leslie Judge :D)

#15 colinbm

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Posted 20 October 2014 - 11:20

Thanks Peter
Thanks for Mr Biro's story too.
I called it a biro as I thought it would be more likely to be internationally recognized what I was talking about.
Col

#16 nfoto

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Posted 20 October 2014 - 15:40

Had not the faintest clue what 'biro' was - sounded like a dubious beer to my ears ...

#17 JCDowdy

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Posted 20 October 2014 - 22:45

Dubious beer names seem to be in vogue.
Question is, would you have tasted it regardless?

Edited by JCDowdy, 20 October 2014 - 22:46.


#18 Andrea B.

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Posted 21 October 2014 - 01:05

I always wondered where 'biro' came from !! Didn't know that guy invented them.
Andrea G. Blum
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#19 nfoto

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Posted 21 October 2014 - 08:35

Aha. Ballpoint, not a dubious beer. Perhaps the usual designation would have been better after all?

#20 Andrea B.

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Posted 21 October 2014 - 18:03

That *is* the usual designation for many people. "-)
Andrea G. Blum
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