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Many a rough neck has been killed by hydrogen sulfide,in higher concentrations it desenticises(sp) the ability to smell,anything over 10 PPM supplied breathing air is required.Sulpheric acid in a car battery produces H2S when it undergoes charging because it is being heated,alluminun sulfide might act as a catalyst to release the hydrgen in sulphuric acid,not for sure,anyways,sometime harmless chemicals mixed with other somewhat harmless chemical can be extremely dangerous,just like bleach and ammonia.