raking light studies, 1993-08 - 1994ultraviolet light studies, 1994-06 - 1994stereomicroscopy, 1993 - 1994support analyses: canvas, 1993 - 1994infrared photography, 1993-08 - 1993-08infrared photography, 1994-09-01 - 1994-09-05infrared reflectography, 1994-08 - 1994-08FTIR, 1993 - 1994not specified, 1993-08 - 1994-09x-radiography, 1993-12-20 - 1993-12-20normal light studies, 1993-08 - 1994-09