Just published “Practical notes on ultraviolet technical photography for art examination” Conservar Património 21, 53-62, 2015.
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This paper discusses two technical photographic methods based on the use of ultraviolet sources for art examination: Ultraviolet fluorescence (UVF) and Ultraviolet Reflected (UVR). While the first imaging can be realized with any digital camera, UVR images are acquired with digital cameras modified to be full spectrum since their sensitivity is extended into the ultraviolet region until about 360 nm. This modification consists in the removal of the in-built hot mirror filter on the CCD or CMOS sensor, which in turn renders it sensitive to ultraviolet and infrared light. This paper illustrates the procedures and the equipment to perform these methods discussing case studies and prepared samples.
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