Each work of art that arrives at the C.R.A. Conservación y Restauración de Arte workshop is subjected to detailed photographic documentation, using visible light, of the initial state, all the phases of the restoration process and the final state.
- Macro and microphotography. To document key technical data about the paint layer, alterations or signatures, identifying marks, etc., we take digital macro and microphotographs using macro lenses or a camera mounted on a binocular microscope.
- Raking light photography. This technique makes it possible to obtain valuable information about the construction technique used and the conservation state of the artwork. Raking light photography is done by illuminating the object from one side, with the source of light at an angle of incidence that is always greater than 80°. In this way, the three-dimensional aspect of the object’s surface comes into view as a consequence of the shadowed areas that are created, often making it possible to obtain pertinent information.
- Transmitted light photography. With this technique, the source of light – in this case visible light – is placed behind the painting, making it possible to photograph the transparency of the object’s materials. This technique can only be used when the support allows partial transparency to visible light, as is the case with some canvas paintings with non-laminated supports. The image obtained provides important data about the support’s state of conservation, revealing cracks, losses, tears in the fabric and information about the thickness of the preparation and paint strata.
- Ultraviolet fluorescence photography. Of all the diagnostic methods in the field of historico-artistic property, ultraviolet fluorescence examination is particularly useful when identifying prior interventions, such as retouching and superimposed varnish layers. Observation using ultraviolet fluorescence can differentiate or reveal the presence of materials that are not easily distinguished with visible light, making it possible at times to identify different substances or revealing specific accumulation.