What stains your teeth more coke coffee or red wine?

coffe

Because i myself have to do an experiment in school and my experiment was what stains your teeth the most? I tested on four drinks sprite, coke, tes, and coffee all at the same time and all for twenty five minutes. After the tweny five minutes the coffe eggshell was the darkest, tea and coke were a medium brown and sprite was white.so by my experience coffe seemed to be the one that came out the darkest.