Joker's blood is toxic due to his exposure to a chemical that altered his physiology, turning him into a deranged and dangerous criminal. This chemical, which he was exposed to during a robbery, not only changed his appearance but also poisoned his blood, making it harmful to others.
            
            
            
            
            
            
           
          
          
            6 answers
            
            
  
    
    Tommaso
    Tue Dec 17 2024
   
  
    The exact cause of the infection remains unknown, with one notable exception.
  
  
 
            
            
  
    
    CryptoDynasty
    Mon Dec 16 2024
   
  
    Alternatively, they might have already been present in the clown's blood.
  
  
 
            
            
  
    
    GinsengBoost
    Mon Dec 16 2024
   
  
    The infection is believed to have originated from Joker's mutated blood.
  
  
 
            
            
  
    
    AzrilTaufani
    Mon Dec 16 2024
   
  
    The interaction between these chemicals and Joker's blood is thought to have led to the mutation.
  
  
 
            
            
  
    
    TaekwondoPower
    Mon Dec 16 2024
   
  
    Scientists suspect that certain chemicals played a role in the mutation.