What chemical that ace has that turn red hood into joker

I want to know what type of chemical that turn into joker or jack Napier into the joker .because I search all over the web for chemical plant accident but it nothing but blow ups. No victims falling into vat of chemicals then for example the most infamous one was the original red hood fell into the vat of chemicals and after too king the helmet off .he saw his reflection and his skin is clown whit and lips bloody-red even green hair. So what type of chemicals that turn jack Napier for example into the joker.