Question

Need to know how green tomatoes turn red

Answer 1

Green tomatoes are actually unripe tomatoes, and they change color when the ripening process is completed. When they are exposed to ethylene gas (a natural hormone produced by plants), they turn red.

Answer 2

When the fruits are green, they get this color from chlorophyll. When they progress from maturity to ripening, they produce a naturally-occurring hormone called ethylene. The ethylene initiates the ripening process, triggering the fruit to start turning red and also to soften.