It's also on this person's head.

I say it's because you like cheese, but there ain't nothing wrong with that. Cheese gewd.

Now eat the Sonic Curry.

Since merchandising, the turtles were always meant to have different skin colors to make themstand out from each other. 80s cartoon didn't do this, since it was cheaper to animate four similar characters. If you look closely at Raphael in the 2003 series, his green skin is darker than the others.

Nowadays, it's only worth is being traumatized from background characters and watching Rubber Ducky flip out