How many lasers were used to make this photo? What is going on?
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Mystery Photos 1  Answer

There is only 1 beam from a Blu-ray violet laser entering at the lower left photo.
The beam then splits in two.
1/2 of the beam just misses the glass and goes through to be the blue beam through the tonic water and exits quietly right.
The other 1/2 strikes the green glass and enters the fluorescein.
One part stays in the green glass with multiple internal reflections.
The other part exits the glass on the first reflection to go to the orange fluorescing liquid to pass through and hit the paper as a blue spot.

And the colours?
Green is fluorescein from eye drop minims. It is used for staining live tissue for corneal damage. So non toxic. Similar dyes are used in antifreeze. I could have used a fluorescent yellow highlighter pen.
The blue is tonic water. Fluoresces blue from the quinine. I suppose tasty in a gin and tonic.
The orange is Rhodamine, a fluorescent dye used in lasers and is toxic.
The 4th colour is of course where the beam hits the white paper and is a bright violet/blue white due to the bleaches and fluorescent whiteners.

So what colour is the laser if I highlighted the beam with smoke?

See my Google+ post with 29 comments.  See how you went compared to other people.

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Google+ Sept 25, 2011 with 29 comments
Google+ Second time May 28, 2013 with 23 comments

Photo Date: March 8, 2008