What's this taste like?

A couple of nights ago Isabella wanted to play with play dough, so we let Zach try it too. When we started, he decided to taste it. He wrinkled his nose and said "yuck." After that, he would be fine until we made something new. Then, he'd look at it and taste again. Same result. He must have tried 10 different times, but it never got any better. :-)