Hi,this bottle was received with a touch-to-dust plastic cork and few gray sandy matter in it.It seems like a Japanese military poison bottle during WW2.There are 6 characters around the skull,the 2 bigger means "highly toxic",4 smaller under the skull is a bit blur to read,I think the first one means "empty"or"air",the last one means"use".Is the sandy matter probably the original poison?I cleaned the bottle with washing power and disinfectant(NaCLO),still a bit of fear..