Hi all, here's my talismanic keris, blade is 139mm long with a slot cut through the blade. When I bought it I was told the slot was for poison

in the bottom half of the slot there is a colourless residue which I have left well alone! Does anyone know any significance to the stripe down the sheath? It has been carefully shaped to ensure the stripe in the middle. The blade also appears to have a very stylised "putut" too.