Whats this called?

Something ive always wondered… When my plants are ready to switch from veg to flower all colas “dim” a bit, get a little yellow hue to them. Then flowering starts. What is that called?? Scientific name or slang???

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The yellowish new growth is the chlorophyll struggling to keep up with the rapid growth. Usually you experience this in the plants preflower stretch. Not sure of a scientific term or phrase

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