National Geographic : 1983 Nov
0. LOUIS MAZZATENTA,NATIONALGEOGRAPHICSTAFF(BELOW RIGHTAND ABOVE) Researchers are still attempting to discover the compositionof Leonardo's paints. Italy's Olivetti Corporation provides funds and equipmentfor that work as well asfor the restoration. The PolaroidCorporationprovides photographicdocumentation.Time estimatesfor completingthe project range from three to five years. Restoring the "Last Supper"