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In this cross-section the first shellac layer is a very thin, uneven film on top of the wood. This shellac coating is too fragmentary to observe any characteristic cracking or degradation pattern. The second and third finish generations are pigmented varnishes, and the fourth generation is the most recent unpigmented plant resin varnish. There is also an oily, grimy film on the surface of the most recent coating.  This may be an oily maintenance dressing applied to the table which also penetrated through cracks into the wood fibers.
 

CTA14

Sample 3 - Top of pad foot. Visible Light, 200X.

CTA15

Ultraviolet Light, 400X.

CTA16

Ultraviolet Light, 200X.

CTA17

UV Light & DCF for the presence of saturated and unsaturated lipids 200X + reactions for oil in the grime layer, and trapped in the wood fibers

 

Sample 4 - Stem egg and dart

 
There is shellac trapped in the wood substrate, but no consistent layer of shellac remaining on the surface of the wood. Generations 2 and 3 are pigmented varnishes, and the most recent coating in generation 4 is an unpigmented plant resin varnish. There is an oily grime layer on the surface.
 

CTA18

Sample 4 - Stem egg and dart. Visible Light, 200X.

CTA19

Ultraviolet Light, 200X.

CTA20

Ultraviolet Light, 400X.