We propose the investigation of four slag samples coming from an Iron Age furnace in Hüttenberg (Hesse Region, Austria). The materials we intend to measure were recovered from the furnace in three different positions: one sample comes from the bottom of the furnace, two are originating from the internal body, and are composed by partially reduced material, while the last piece is a sponge bloom. The results from the measurements will allow us to give a picture of several factors, namely, information on the raw materials, reconstruction of the pirotechnology in use, methods of production, efficiency of the smelting process.