Mapeo de fluorescencia inducida por láser de pigmentos en murales secco pintados
Resumo
La fluorescencia inducida por láser es una técnica de análisis a distancia, aplicada con éxito en tiempo real para el diagnóstico de obras de arte, permitiendo la observación de características invisibles al ojo humano, como rastros de retoques o la presencia de consolidantes modernos.
El objetivo de este artículo es generar una base de datos de pigmentos históricos con sus respectivos aglutinantes y consolidantes, realizada para respaldar la identificación remota y el mapeo de estos materiales en un mural de la forma menos invasiva posible. Para este objetivo, se ha utilizado una fuente láser monocromática ultravioleta que emite a 266nm con escaneado remoto en combinación con reflectancia. Se realizaron modelos de pintura mural en técnica a secco de acuerdo con las recetas tradicionales del siglo XVII.
Análisis digital de imagen, análisis de componentes principales y mapeado de ángulo espectral ha sido llevado a cabo para obtener los datos de mapeado de dos pigmentos seleccionados, azul esmalte y rojo carmín en una pintura mural real (siglo XVII). Esta técnica no invasiva nos permitió trabajar de manera remota, a una distancia de 11 m de la obra de arte. Los resultados son consecuentes con los microanálisis tradicionales llevados a cabo para identificar pigmentos mayoritarios.
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