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Eye protection may be impossible with your method. For example red and blue laser ( the red requires blue filter) while the blue requires red orange. You would have to put Two safety goggles on. Well good luck this is just my theory on eye protection. Make sure that the lasers are 50 mw or under if you want to do this.
Here is an alternative method but it is more expensive.
You could even place a cd case underneath the flask. Even better a near UV laser that could reflect the purple laser into the solution (yellow marker dye). I will be doing this in a few weeks.Laser line 405 nm firing at beaker or flask. with stirer and dilute yellow marker dye with CD case underneath.
I have done with rotating water and oil from a magnetic stirer device. Here is a pic. The solution causes the laser to rotate different directions. You could even have two or three lasers.
Personal Wicked Laser Light Show
Easy Gory FX Makeup
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