Chlorophyll reflect green and transmits red. If you take a bottle of it and shine a flashlight on it, the side with the flashlight will look green, but if you look through the other side, you will see red.
This is because chlorophyll is good at absorbing certain frequencies of light that center around green colors. What is left over is the reds that do not get absorbed by it.
You get a similar effect with some plants.
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