Cross-section Analysis Before Treatment: UV Illumination

When viewed under ultraviolet light, the same sample seen on the previous page reveals even more information. UV illumination enables greater discrimination of the materials present due to differences in fluorescence. Particularly noteworthy are; (1) the remains of fossilized prehistoric micro-organisms that appear in chalk; (2) a thin glue layer applied before the base coat to the surface of the ground layer; (3) the irregular design layer that corresponds to the micro-cissing seen on the paint surface; (4) remnants of an early clear coating that has a bluish fluorescence and appears discontinuous similar to the dark brown paint directly beneath it; and (5) a continuous tinted varnish layer applied during a previous restoration, probably in an attempt to reduce the visual effect of the micro-cissing.

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