Savaria - A Vas Megyei Múzeumok értesítője 29. (2005) (Szombathely, 2006)

Műtárgyvédelem - Ferencz Eszter: Mikroszkópos anyagvizsgálatok jelentősége egy késő római tűkarc-díszes pohár esetében

Savaria a Vas megyei Múzeumok Értesítője, 29 (2005) was possible to examine very clearly under the microscope the faults due to manufacturing technique (air and contamination marks), the alteration points brought about by ageing, the rough glass core brought to the surface by crumbling, the decoration technique, and the peculiarities deriving from shaping process. With the help of these microscope examinations, it was possible to prepare a technical and decoration description of the object and of the ageing phases, in the light of which the chosen cleaning procedure had to be changed. It could be shown from the instrument examinations that the consistency of the cup matched that of late Roman sodium glass. During the restoration, the fragments of the cup were first lifted carefully out of the ball of earth and a sample of earth was prepared for the material examinations important for archaeology. After dry, mechanical cleaning with the fragments with a brush, the fatty, polarized contamination was removed with a 2 per cent warm-water solution of fatty-acid sulphate anion surface-active material, followed by the contamination of carbonate origin by chemical means, using a 5 per cent solution of sodium hexametaphosphate in water. With the products of the crumbling, only local use was made of low-density packing with oxidizing agent, followed by packing with malonic acid mixed with 5 per cent carboxyl-methylcellulose. The glass fragments were rinsed with alcohol after each wet cleaning process. The cleaned fragments were fitted together in a dry state with gluing strips. The gluing material was epoxy resin was dribbled onto the breakage surfaces. The additions were fabricated with coloured epoxy resin. Finally, the prepared surfaces were scoured and polished to a silk shine. 299