It is basically the same as the one for the red! chloropyll is responsible for plant pigmentation (color) and in the case of the purple tomato, a green flesh gene prevents the normal chlorophyll breakdown. The resulting effect is the generation of a brownish compound which when it mixes with the red/pinkish color of the tomato could result in black or purple colors.
Thanks for stopping by! @headchange
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Thanks for the extra info. You sure do know your tomatoes