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Examination under ultra violet light

painting of a Renaissance scene with crowds in a courtyard seen under a tinted green/blue light

The painting under ultra violet light. Zoom into the detail of this image.

Ultra violet light photography will show the fluorescence of some surface layers, for example the milky green colour of the very thick natural resin varnish. Areas of retouching may have little or no fluorescence and so appear as dark patches in this photograph.