PROCON TT 49: Laser cleaning of ancient Egyptian wall paintings and painted stone surfaces

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Abdel Ghafour Motawea ◽  
Joost Caen ◽  
Koen Janssens

Abstract In this study, we evaluated the ease of removal of soot layers from ancient wall paintings by employing double network gels as a controllable cleaning method. The ceiling of the temple of Seti I (Abydos, Egypt) is covered with thick layers of soot; this is especially the case in the sanctuary of Osiris. These layers may have been accumulated during the occupation of the temple by Christians, fleeing the Romans in the first centuries A.D.. Soot particulates are one of the most common deposits to be removed during conservation-restoration activities of (Egyptian) wall paintings. They usually mask the painted reliefs and reduce the permeability of the painted surface. A Polyvinyl alcohol-borax/agarose (PVA-B/AG) double network gel was selected for this task since its properties were expected to be compatible with the cleaning treatment requirements. The gel is characterized by its flexibility, permitting to take the shape of the reliefs, while also having self-healing properties, featuring shape stability and an appropriate capacity to retain liquid. The gel was loaded with several cleaning reagents that proved to be effective for soot removal. Two sets of soot removal tests were conducted with these gel composites. The cleaned surfaces were examined in situ with the naked eye and with a digital microscope in order to select the best gel composite. The gel composite, loaded with a solution of 5% ammonia, 0.3% ammonium carbonate, and 0.3% EDTA yielded the most satisfactory results and allowed to safely remove a crust of thick soot particles from the surface. Thus, during a third phase of the study, it was used successfully to clean a larger area of the ceiling.


Vacuum ◽  
2009 ◽  
Vol 83 ◽  
pp. S4-S8 ◽  
Author(s):  
Shaaban Abd El Aal ◽  
A. Korman ◽  
A. Stonert ◽  
F. Munnik ◽  
A. Turos

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hussein Marey Mahmoud

Purpose This contribution aims to introduce an effective low cost polymer-nanocomposite for possible application to achieve a super protection for highly damaged ancient Egyptian wall paintings. Design/methodology/approach SiO2 and Al2O3 nanoparticles were synthesized by the sol-gel method. Then, the polymer-nanocomposite was prepared by simple mixing and dispersing the nanoparticles into the tetraethoxysilane polymer solution, with the aid of an ultrasonic dismembrator. The application of the polymer-nanocomposite and other polymeric nanodispersions, on laboratory models, was performed by the brushing technique. Next, the materials stability was evaluated by means of digital optical microscope, colorimetry, FE-scanning electron microscope, measuring the static contact angle and water absorption rates. Findings The results were promising in creating a superhydrophobicity and the static contact angle (?S) measured for the polymer-nanocomposite reached 135o. An average of three measurements of the water absorption rate after polymer-nanocomposite treatment was 0.66 g/m2 s, compared to 2.60 g/m2 s for the control model (untreated). Further, an average of color difference (?E*) for the treated surface was 2.78, and after the accelerated thermal aging was 3.6. Observing the surface morphology, the polymer-nanocomposite enhanced the roughness of the treated surface and showed a high resistance to laboratory salt weathering. Practical implications Preparation of a polymer-nanocomposite by adding SiO2 and Al2O3 NPs to tetraethoxysilane polymer has been proposed. As a promising conservation material, the produced polymer-nanocomposite helped to form an efficient protective film. Originality/value This paper attains to develop an economic polymer-nanocomposite to maintain a high protection to damaged ancient Egyptian wall paintings and similar objects.


2000 ◽  
Vol 1 ◽  
pp. S199-S207 ◽  
Author(s):  
Carolina Gaetani ◽  
Ulderico Santamaria

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Abdel Ghafour Motawea ◽  
Joost Caen ◽  
Koen Janssens

Abstract In this study, we evaluated the ease of removal of soot layers from ancient wall paintings by employing double network gels as a controllable and safe cleaning method. The ceiling of the temple of Seti I (Abydos, Egypt) is covered with thick layers of soot; this is especially the case in the sanctuary of Osiris. These layers may have been accumulated during the occupation of the temple by Christians, fleeing the Romans in the first centuries A.D.. Soot particulates are one of the most common deposits to be removed during conservation-restoration activities of ancient Egyptian wall paintings. They usually mask the painted reliefs and reduce the permeability of the painted surface. A Polyvinyl alcohol-borax/agarose (PVA-B/AG) double network gel was selected for this task since its properties were expected to be compatible with the cleaning treatment requirements. The gel is characterized by its flexibility, permitting to take the shape of the reliefs, while also having self-healing properties, featuring shape stability and an appropriate capacity to retain liquid. The gel was loaded with several cleaning reagents that proved to be effective for soot removal. Soot removal tests were conducted with these gel composites. The cleaned surfaces were evaluated with the naked eye, a digital microscope, and color measurements in order to select the best gel composite. The gel composite, loaded with a solution of 5% ammonia, 0.3% ammonium carbonate, and 0.3% EDTA yielded the most satisfactory results and allowed to safely remove a crust of thick soot layers from the surface. Thus, during the final phase of the study, it was used successfully to clean a larger area of the ceiling.


2011 ◽  
Vol 14 (14) ◽  
pp. 224-248
Author(s):  
Marzouk El Sayed ◽  
Rasha M. Omran ◽  
Dina Ezz El Den ◽  
Hoda Mounir ◽  
Sara El Sayed ◽  
...  

2002 ◽  
Vol 30 (2) ◽  
pp. 529-550 ◽  
Author(s):  
Hyungji Park

IN 1821 IN PICCADILLY, Giovanni Battista Belzoni staged a spectacular full-scale reproduction of royal tombs he had uncovered in the Valley of the Kings. Crowds of paying visitors milled through rooms at the Egyptian Hall, marveling at enormous stone artifacts and at colorful wall paintings replicating ancient Egyptian tomb interiors. About half a century later and around the globe, tens of thousands of guests, including many European luminaries, witnessed the grand 1869 opening of the Suez Canal and fêted the achievement of its chief engineer, Ferdinand de Lesseps, with fireworks and extravagant feasts. The driving forces behind these exhibitions were very different — one was an entrepreneur’s packaging of ancient Egypt into a leisure excursion for Londoners, the other evidence of Egyptian acquiescence to European pressure for enhanced trading routes; one was available for a middle-class, fee-paying popular British audience; the other to specially invited international guests traveling thousands of miles — but both were public displays that rendered Egypt, past and present, into a cultural and visual commodity for the West. Dickens’s final, unfinished novel The Mystery of Edwin Drood (1870), written during the excitement and controversy over the Suez Canal and drawing on both de Lesseps and Belzoni as partial models for the title character, is deeply aware of such Egypt-gazing, but Egypt’s presence within the novel is in fact highly unspectacular, almost invisible.


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