Nope, only negative emotions, there are other techniques that will erase ANY emotion, but you dont want to know about those
, thats whats so great about EFT, its harmless, it returns you to you normal healthy state only, like a doctor, for when you are sick and not normal, the doctor gives you pills and stuff to return you to your normal healthy state, EFT is the same but for emotions, it even has broader benefits, it can make you better at sport for example.
EFT Provides Impressive Health and Emotional Freedom--New Discovery Often Works Where Nothing Else is the oficial site, it has a manual (free) with a better explanation of how it works.