Fading of artists' colorants by a mixture of photochemical oxidants |
| |
| Institution: | 1. LIBPhys-UNL – Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;2. Arquivo Municipal de Lisboa, Rua B Bairro da Liberdade, Lote 3-6, Piso 0, 1070-050 Lisboa, Portugal;3. CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;4. LIP - Laboratory for Instrumentation and Experimental Particle Physics, Av. Prof. Gama Pinto, n.2 Complexo Interdisciplinar (3is), 1649-003 Lisboa, Portugal;1. Institute of Geography and Geology, University of Würzburg, Am Hubland, 97074 Würzburg, Germany;2. Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa;3. Departamento de Geología, Facultad de Ciencias, Universidad de la República, Iguá 4225, 11400 Montevideo, Uruguay;4. Facultad de Agronomía, Universidad de la República, Garzón 780, 12900 Montevideo, Uruguay;1. Instituto História da Arte da Faculdade de Letras da Universidade de Lisboa (IHA-FLUL), Alameda da Universidade, 1600-214 Lisboa, Portugal;2. LIBPhys-UNL: Laboratory for Instrumentation, Biomedical Engineering and Radiation Physics, Departamento Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;3. Laboratório José de Figueiredo da Direcção-Geral do Património Cultural (LCRJF-DGPC), Rua das Janelas Verdes 37, 1249-018 Lisboa, Portugal;4. Laboratório HERCULES, Universidade de Évora, Rua Romão Ramalho 59, 7000-676 Évora, Portugal;5. Instituto Politécnico de Tomar (IPT), Quinta do Contador-Estrada da Serra, 2300-313 Tomar, Portugal;6. Museu Nacional de Machado de Castro, Largo Doutor José Rodrigues, 3000-236 Coimbra, Portugal |
| |
| Abstract: | Thirty-five artists' colorants were exposed for 12 weeks, in the dark, to a mixture of photochemical oxidants including ozone (200 ppb), nitrogen dioxide (75 ppb) and peroxyacetyl nitrate (PAN, 15 ppb) at ambient temperature and humidity. Color changes were measured weekly using a reflectance color analyser and were also calculated from the 380–700 nm reflectance spectra of unexposed and oxidant-exposed colorant samples. Exposure to the oxidant mixture resulted in substantial fading for nine colorants (10–60 ΔE units) and moderate fading for three colorants (2–5 ΔE units). Increasing the air humidity from 46 to 83% resulted in a substantial increase in fading. The results are discussed in terms of oxidant-fugitiveness vs colorant chemical functionality and for their implications with respect to oxidant damage to colorants in museums. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
