Thanks for the links Dave. I do not think I will put the black stuff to the test
. There are more "Bushman" than the "San" who may have used a different poison. These items have some age and a traditional life was lived by most groups untill the 1950s-60s. One of your links has made me think about this spear I have had kicking around. I did not know what to make of it. Perhaps it is the kill spear of the Bushman? It is of a Southern African form with some unusual aspects. The end is quite different from other South African spears. It seems never to have had any metal on the end either. Interesting?
I would reenact Crecy in the back garden but the neighbours might laugh at me
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