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Does food coloring affect plants? If it does, how?
Question Date: 2014-08-06
Answer 1:

Food coloring usually consists of water-soluble pigment molecules that disperse into anything with water. Plants, like most organisms consist of a large amount of water and so these pigment molecules spread through the water in a plant and can show you where water travels in a plant. Physiologically (photosynthesis, metabolism etc), it's unlikely that food coloring inhibits plants as most food coloring is harmless.

*Bonus: Blue food coloring, for example, is blue because it absorbs all other colors of the rainbow and reflects blue light. That's why it looks blue; that's the color of light that is reflected into our eyes by the pigment molecule.


Answer 2:

I don't know if any food coloring affects plants in how they live. I do know that food coloring can be used to give flowers (famously carnations) extra colors if it's in the water that the plants are growing in, but I don't believe anybody has found any effects that food coloring has on the plants themselves.

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