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Perception is key here, light refraction and density of water. The food coloring "freezing" has nothing to do with it. Less light reaches the middle of the colored water because of the additional FC molecules dispersed throughout the H2O molecules so it appears darker and as though the color has "condensed" here, it's just refraction and density. imo.
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you can tell them all you want but it won't matter until they think it does
p.s. I contradict my contradictions, with or without intention, sometimes. 
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