Mariam Sonntag
Abstract
Micromosaics have their origin in 18th-century Rome and consist of tiny, colorful, opaque glass rods set in mortar on a support tray. This study looks at the history of micromosaics, at materials, and techniques as well as construction and condition phenomena with reference to objects from the Gilbert Collection. The theoretical and practical research informed conservation treatments and is a contribution to an underrepresented area of study.
Using the Gilbert Collection, and the Poggioli tabletop specifically, the materials of the glass, mortar, and support were analyzed using mainly nondestructive methods (UV light, x-radiography, x-ray fluorescence spectroscopy, FTIR, and GCMS). Following that, conditions and causes of damage were assessed. The author tested three different injection grouts for use in a treatment to stabilize cracks, loss margins, and voids, and to reinforce the structure of the object, to slow down ongoing deterioration and to prevent further handling damage. Utilizing Ultrasonic Pulse Velocity and Acoustic Emission guided treatment decisions and the determination of success of the treatment.