Why have i got yellow fingernails?

I am 13 years old and in the summer painted them all different colours. now after removing them they are yellow about half way down.


I do not smoke and they are quite long.Why have i got yellow fingernails?
just dicolouration. itll take a while to fade. next time use a basecoat before your nailpolish.Why have i got yellow fingernails?
It could be a vitamin issues, but it's probably just because you had paint on them so much. I have to have a paint free day at least once a week. i also wear a clear undercoat when they are painted to help protect my nails.