I can't comment on the sulpher, but snakes can slither along without a scratch across rocks, trees, burning sand/asphalt, then how would egg shells harm their belly skin? If sulpher works for real, I think I might buy it by the truckful and completely surround my entire property line. Does anyone know if the available form has the "sulpher" smell? I don't want to make my neighbors complain about a "rotten egg smell" and have them thinking it's the chickens they're smelling--come to think of it, I don't particularly want to live with the smell myself. So, I'm hoping they sell it in some form that doesn't have that smell.