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.
Pigments Checker is for photographers, conservators and scientists interested in technical documentation of paintingss. It has 54 swatches of historical pigments designed for infrared photography, ultraviolet photography and other technical photographic methods for art examination. Check it out!
Pigments Checker is a collection of 54 swatches of historical pigments that have been applied using gum arabic as a binder on a cellulose and cotton watercolor paper, acids and lignin free. This paper is not treated with optical brighteners, it’s slightly UV fluorescent, and it reflects IR. Two cross-hair lines, 0,2 mm (vertical) and 0.4 mm (horizontal) are printed on each swatch of paper before the application of paint, in order to have a means to evaluate the pigments’ transparency in the IR and IRR imaging. Among all the pigments and their varieties ever used in art these pigments collection select the most used ones from antiquity to early 1950’.
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