The keris is the distinctive weapon of Malaysia and Indonesia. It is found in a variety of forms but, typically, it is an elongated dagger or short sword of slender proportions with a blade of rough pattern-welded texture sharpened on both edges.All good Southeast Asian keris are made of two sorts of metal, iron (or steel) and pamor welded together in intricate patterns and subsequently brought out on the polished surface of the blade by etching.Pamor, is the etch-resistant component traditionally used in the blades, and includes a variety of metals.In order to investigate the composite structure of the keris and the different types of pamor effectively used, we propose to analyze three keris provided by the Wallace Collection in London and one by a private collector whose typology has been extensively described in literature.