Do different emotions produce different tears?
Basal tears 


  are always in our eyes to serve the purpose of lubricating, nourishing, and protecting the eyes. 


Reflex tears


  protect the eyes from irritants, including wind, smoke, or onions.


Tears produced by emotion  


  Although these tears contain higher levels of stress, such as ACTH and enkephalin, and endorphin and natural pain killer, they can also work by directly calming the iris down while signaling the emotional state to others.


Secretion of tears 


  The lacrimal gland, located in the outer part of the upper eye, is constantly secreting a protein-rich, antibacterial liquid. This fluid goes from the outer edge of the eyeball toward the cornea and lubricates the entire eye surface every time we blink.


Sources:


http://archopht.jamanetwork.com/article.aspx?articleid=625096
http://www.sciencedirect.com/science/article/pii/0002939481906516