ABSTRACT
The white plaster covered all the walls of the church, with black linear frames surrounding the windows. The perimeter of the three apses was surrounded by simple frames with floral decorations. The plaster on the walls was applied in different layers. The intermediate layer was composed of a compact coating with a large amount of vegetable fibres. The analysis carried out on the superficial layer of the plaster detected the presence of a light-grey superficial plastering mixed with a black carbon pigment used to create a light-grey gradation on the surface. The restoration of the basilica plasters was preceded by an analysis of the present condition of the church and an investigation of the historical events which contribute to its actual appearance. The plasters were covered by thick deposits of dust, caused by candle smoke, and by dark drippings and dark-brown stains caused by deposits of dusty material and tannin, transported by rainwater infiltrations through the wooden covering.
