If anda put food colouring in a potato seed will the potato grow purple?

that would be awesome

no it might turn blue anda didnt say purple food die so it might be berwarna merah muda, merah muda atau green i think anda know what i mean

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