If bạn put thực phẩm colouring in a potato seed will the potato grow purple?

that would be awesome

no it might turn blue bạn didnt say purple thực phẩm die so it might be màu hồng, hồng hoặc green i think bạn know what i mean

No, if you're only working with the seeds bạn would have to change the potatoes' genes.
But bạn might get some effect if bạn constantly water the plant with heavily dyed water.(or bạn can bởi potatos that are already purple)