#12713
Profile photo of Andrew Normand

I showed you a £5 note under IR illumination from one of the above LEDs.

You can either do this in the dark or use a visible light filter.
The one I had was from mindsets and cost £7.15

http://tinyurl.com/kbamlmc

You could just purchase some polarising filter. For £1.74 and cut out two pieces then cross them at 90 degrees 

http://tinyurl.com/mfqfawu

Developed film and the inside of old floppy disks also works

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