nitroglycerin blasting cap ?

i was wondering if there i such a thing as a nitroglycerin based blasting cap with no other HE (high explosives ) or primary explosives. products of nitroglycerin would be acceptable but as far as i know it only form more HE's so if this is possible please let me know

No there are no nitro based blasting caps. Nitro is vary unstable stuff. Explosives experts don't even like dealing with it in a some what stable form such as TNT. Besides such things hare heavly regulated and require special licenses and permits to even gain access too it.