Hi nechesh. I recall yoni as different energy from the bearer who naturally possess lingga one, where the combination believed to alive both the keris and the bearer. I dont know if it has the same meaning in other area/culture. Sounds like im yang energy of the Chinese. /cough.
People at Coggins said that it only work with living things. Well, ...it did not cost a lot for small spontaneous experiment and so they did as I said after I went home back to get the keris, and now I become curious. There were some color explanation from Coggins but it explains the meaning of aura discharged only by human. It seems none keris people in Indonesia has the Kirlian nor none Kirlian people abroad has keris.