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Abstract(s)
O presente trabalho surge no âmbito da dissertação de Mestrado em Conservação e Restauro de Bens Culturais e da bolsa de mérito atribuída pela Santa Casa da Misericórdia do Porto. Tem como objeto de estudo a coleção de numismática do Museu da Misericórdia do Porto (MMIPO) e como principais objetivos a inventariação, o tratamento e o acondicionamento da referida coleção, bem como o desenvolvimento de metodologias de inventariação e limpeza adequadas a coleções de numismática no âmbito da conservação e restauro. A metodologia aplicada para a elaboração deste projeto consistiu na criação de normas de inventário especializadas para numismática, na realização do inventário das 1309 moedas que constituem a coleção, e no levantamento de estado de conservação de todas elas. Posteriormente, definiu-se o método de acondicionamento a aplicar e escolheu-se o grupo de moedas a intervencionar. Optou-se por um grupo de 35 moedas em liga de bronze que apresentavam necessidade de intervenção. A metodologia de limpeza aplicada a este grupo teve como objetivo a preservação da pátina de oxidação. Para a intervenção de conservação e restauro, realizou-se primeiro a análise de Microscopia Eletrónica de Varrimento com Dispersão de Energia (SEM-EDS) para confirmar a constituição da liga. De seguida, efetuaram-se doze testes de limpeza, entre os quais limpezas mecânicas, químicas, por ultrassons e com CO2 supercrítico, por forma a determinar qual a mais eficiente e menos prejudicial para a conservação das moedas. Realizou-se a análise de Espectroscopia de Infravermelhos por Transformada de Fourier (FTIR) para confirmação dos resultados da limpeza com CO2 supercrítico. A limpeza mecânica foi a que apresentou melhores resultados a par com a limpeza química tradicional com ácido acético e ácido etileno diamino tetra-acético (EDTA), ao contrário da limpeza com CO2 supercrítico, que obteve os piores resultados. A limpeza com ultrassons aparenta ser promissora, no entanto necessita de um estudo mais alargado. Foi ainda feito um estudo de forma a comparar se o uso de inibidor de corrosão Benzotriazol (BTA) tem influência na limpeza e no aspeto final das moedas. Optou-se pela aplicação de cera microcristalina como camada protetora. Por fim as moedas foram acondicionadas individualmente em bolsas de polipropileno de baixa densidade.
This work is part of the master's dissertation in Conservation and Restoration of Cultural Heritage and was carried out a merit scholarship awarded by Santa Casa da Misericórdia do Porto. It focuses on the numismatics collection of the Museu da Misericórdia do Porto (MMIPO) and the main goals were the inventorying, conservative treatment of and packaging this collection, as well as the development of inventory and cleaning methodologies suitable for numismatics collections in the conservation and restoration. The methodology adopted for in his project consisted in the creation of specialized standards for numismatics, the inventory of the 1309 collection coins and in the survey of their condition. Subsequently, the packaging method to be applied was defined and the group of currencies to be treated was chosen. We opted for a group of 35 bronze alloy coins that needed intervention. The cleaning methodology undertaken in this group aimed to preserve the oxidation patina. For the diagnosis towards the conservation work, the first analysis of Scanning Electron Microscopy with Energy Dispersion (SEM-EDS) was performed to confirm the constitution of the alloy. Then, cleaning tests were carried out, including mechanical, chemical, ultrasound and supercritical CO2 cleaning, in order to determine which is the most efficient and least harmful for the conservation of coins. An analysis of Fourier Transform Infrared Spectroscopy (FTIR) was performed to confirm the results of cleaning with supercritical CO2. Mechanical cleaning was the one that presented best results along with the traditional chemical cleaning with acetic acid and ethylene diamino tetraacetic acid (EDTA), in contrast with the cleaning with supercritical CO2, which provided the worst results. Ultrasonic baths appears to be promising, however we need further studies. A study was also carried out to compare whether the use of benzotriazole corrosion inhibitor (BTA) has an influence on the cleaning and the final appearance of the coins. It was decided to apply microcrystalline wax (Cosmolloid 80H) as a protective layer. Finally, the coins were packed individually in low density polypropylene bags.
This work is part of the master's dissertation in Conservation and Restoration of Cultural Heritage and was carried out a merit scholarship awarded by Santa Casa da Misericórdia do Porto. It focuses on the numismatics collection of the Museu da Misericórdia do Porto (MMIPO) and the main goals were the inventorying, conservative treatment of and packaging this collection, as well as the development of inventory and cleaning methodologies suitable for numismatics collections in the conservation and restoration. The methodology adopted for in his project consisted in the creation of specialized standards for numismatics, the inventory of the 1309 collection coins and in the survey of their condition. Subsequently, the packaging method to be applied was defined and the group of currencies to be treated was chosen. We opted for a group of 35 bronze alloy coins that needed intervention. The cleaning methodology undertaken in this group aimed to preserve the oxidation patina. For the diagnosis towards the conservation work, the first analysis of Scanning Electron Microscopy with Energy Dispersion (SEM-EDS) was performed to confirm the constitution of the alloy. Then, cleaning tests were carried out, including mechanical, chemical, ultrasound and supercritical CO2 cleaning, in order to determine which is the most efficient and least harmful for the conservation of coins. An analysis of Fourier Transform Infrared Spectroscopy (FTIR) was performed to confirm the results of cleaning with supercritical CO2. Mechanical cleaning was the one that presented best results along with the traditional chemical cleaning with acetic acid and ethylene diamino tetraacetic acid (EDTA), in contrast with the cleaning with supercritical CO2, which provided the worst results. Ultrasonic baths appears to be promising, however we need further studies. A study was also carried out to compare whether the use of benzotriazole corrosion inhibitor (BTA) has an influence on the cleaning and the final appearance of the coins. It was decided to apply microcrystalline wax (Cosmolloid 80H) as a protective layer. Finally, the coins were packed individually in low density polypropylene bags.
Description
Keywords
MMIPO Numismática Inventário Acondicionamento Limpeza de bronze BTA Numismatics Inventory Packaging Bronze cleaning SEM-EDS