1,721,114 research outputs found
Water-repellent properties of fluoroelastomers on a very porous stone: Effect of the application procedure
No full textA fluorinated elastomeric material with enhanced hydrophobic properties has been studied as a protec- tive coating on Lecce stone. The polymer has been applied, as a butyl acetate solution, on stone specimens according to two different methodologies, i.e. brushing and capillary absorption.
The application performed by brush (amounts equal or greater than 50 g/m2 ) induces the formation of a superficial film, which prevents condensed water from penetrating but, at the same time, considerably reduces the vapour permeability.
On the contrary, when the fluoroelastomer solution is applied by the capillary absorption technique (amounts in the 25–75 g/m2 range), reduction of vapour permeability is acceptable but a poor protection against water penetration is observed. It can be due to a deeper penetration of the polymeric material, which is more homogeneously dispersed in the stone without forming a hydrophobic coating on the surface
PL micro-imaging supported by FTIR mapping for the study of historical musical instruments
No full textCoatings in historical bowed string instruments made in Cremona (Italy) during 17th and 18th C. are often multi-layered systems, where organic binders are variously mixed with inorganic materials to enhance the sound and the aesthetic features of the objects. These materials were applied in superimposed coats in order to seal the wood porosity and prepare the surface to the application of the external varnish.
In this work, we propose to employ photoluminescence (PL) micro-imaging, with hyperspectral resolution, and FTIR mapping to fully characterize the different layers of the multi-layered system, with a specific focus on the interface between the ground coat and the wood
Riscoperta di materiali e tecnologie antiche in liuteria: analisi diagnostiche sui frammenti della viola da gamba Joannes Marcus (II metà del XVI secolo).
No full textColor-based automatic detection of worn out varnishes on Stradivari's "Scotland University" violin back plate
No full textUV-induced fluorescence (UVIFL) photography is widely used in the study of artworks, in particular for the analysis of historical musical instruments (e.g., violins). This technique allows seeing important details, which cannot be observed with visible light, such as retouching, different paints coats, or worn areas of the superficial varnishes. However, the interpretation of UVIFL images may be very complex, in relation to preservation state of the analyzed artifact. The aim of this work is the development of a new tool able to automatically detect the presence of colors related to worn areas on the back plates of historical violins. The proposed solution is a program able to identify some peculiar color hues related to wear, find their position on the surface and compute their percentage respect to the total area. The study was performed on UVIFL imagery of Stradivari's Scotland University violin (1734) held in the Museo del Violino in Cremona (Italy)
Surface coating on Bertesi's wooden bas-relief (17th century)
No full textIt is known that the physical properties and the conservation rate of a wooden artefact are strictly
related to its surface treatment, especially in order to control mechanical and rheological
properties and to increase the durability of the wood. The pictorial film of painting forms a
structure that, adhering to the wood surface, plays both a protective and an aesthetic role. In
order to restore artefacts, it is important to know the original function of the external coating. The
aim of this paper is to define the nature and the function of a white coating covering all the surface
of a bas relief made by Giacomo Bertesi, one of the most important artists and wood carvers in
northern Italy, in the second half of the seventeenth century. Three microsamples were taken from
the surface. Micro-Fourier transform infrared and scanning electron microscopy–energy
dispersive X-ray spectroscopy analyses were performed to characterise the materials and the
different layers
Studio e caratterizzazione delle vernici negli strumenti musicali antichi: i mandolini Vinaccia (1769-1787)
No full text- …
