O sangue do Kaiju é baseado em amônia. Per Guillermo Del Toro:
"The second thing that the Kaiju do which is, they decompose and they release an agent called Kaiju-[blue] that completely destroys the cities, makes the air impossible to breathe. The blood is completely acidic. So they figure out that the base of fluid of the Kaiju is ammonia-based. So how do they neutralize it? But it takes a while because, first of all, it melts the pavement, melts the structures around it, makes a noxious gas. By the time they get to a Kaiju, the first few attacks, they can't even get samples or corpses or pieces to analyze it. The Kaijus are essentially triggered to self destroy if they fall. So it's a very smart weapon."
Como visto neste vídeo da Comicon antes do lançamento do filme em 2013 -
A amônia é bastante tóxica para a vida marinha, por da Wikipedia :
The toxicity of ammonia solutions does not usually cause problems for humans and other mammals, as a specific mechanism exists to prevent its build-up in the bloodstream. Ammonia is converted to carbamoyl phosphate by the enzyme carbamoyl phosphate synthetase, and then enters the urea cycle to be either incorporated into amino acids or excreted in the urine. Fish and amphibians lack this mechanism, as they can usually eliminate ammonia from their bodies by direct excretion. Ammonia even at dilute concentrations is highly toxic to aquatic animals, and for this reason it is classified as dangerous for the environment.
Mesmo que não seja normalmente tóxico para humanos e mamíferos, podemos obter o que é chamado > Hiperamonemia , que é um excesso de amônia no sistema sanguíneo. É uma condição perigosa que pode levar à encefalopatia e à morte.
Parece que alguém envolvido no resultado de Kaiju-Blue teria efeitos colaterais adversos. Como Guillermo Del Toro declarou, eles são uma arma muito inteligente .