What happens when two smoke rings of equal size and different colors meet head on? It's almost like art! http://technology.todaysbigthing.com/2009/08/04 -via Metafilter
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What happens when two smoke rings of equal size and different colors meet head on? It's almost like art! http://technology.todaysbigthing.com/2009/08/04 -via Metafilter
You'll find a discussion in this forum.
2nd, it's not smoke but liquid with coloring.