During excavation in the insula 12 from the Regio IX which began in 1987, in a big hall, traces of wall painting restoration works, probably because of the 79 AD earthquake, were found. Mineralogical and physic-chemical analyses carried out on 40 samples coming from two different rooms brought several evidences on the painting technique and on the working team. A large gamut of pigments was identified: aragonite, celadonite cerussite, disordered hematite, dolomite, Egyptian blue, glauconite, goethite, hematite, malachite, red lead, red ochre, ring-white, soot, volcanic ash and two sorts of yellow ochre. Most of them were identified in the paint fragments from the house of Fabio Rufo.