INDUCTED UV FLUORESCENCE
During the restoration phase, it is very important to understand and differentiate the layers that are superimposed on the original. This issue can be solved through the use of lamps emitting at 365-370 nm, also called Wood’s lamps or blacklight sources, which allow the phenomenon of ultraviolet fluorescence.
UV fluorescence refers to the visible fluorescence generated by ultraviolet excitation: UV rays, not visible to the naked eye, are absorbed by the analysed material and immediately re-emitted in the visible range at longer wavelengths. The quantum phenomenon only occurs in molecules or atoms with a favourable absorption/emission energy band structure. Binders and paints, traditionally of plant origin, are among the main candidates.
In addition, brightness, or fluorescence, varies according to the chemical composition of materials and the time elapsed since its application. For this reason, UV fluorescence is proving to be a very useful technique in the identification of repaints which, being added material and generally less ancient than the original, will result in a darker colour.
Madatec UV projector
Pure emission at 365-370 nm
No significant emission in the visible range (< 390 nm)
Rechargeable, long-life 230 volts battery power supply
Mobile and with adaptation to tripod installation