For Type II photoinitiator polymerization reactions involving, for example, Eosin Y and triethanolamine, there is an abundance of literature describing the mechanism of the regeneration of Eosin Y. However, there is little discussion on the fate of triethanolamine, which is responsible for initiating radical polymerization. Does the triethanolamine flank the end of the newly generated polymer? Or does it have a different fate?