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The finish history in Sample 1 from the back rail is fairly simple. It consists of a pigmented stain with an oil component directly on top of the wood, followed by anuneven shellac layer. This shellac has a blanched, oxidized surface, but no discernible cracking pattern. There is an uneven film of grit, oily material and pigmented wax on the surface of the shellac.
In Sample 2 from the canopy sub frame, the finish history also retains evidence of a pigmented stain on top of the wood. This is followed by an uneven, degraded, fragmentary shellac layer. The clusters of black particles on the surface and trapped in the shellac are black mold spores. This area may be prone to mold as it is covered by a textile. Fluorochrome binding media characterization shows there is oil trapped in the wood, in the pigmented stain, and on the surface of the shellac layer.
Sample 3 from the carved canopy has a very different finish history from samples 1 and 2. The surface of the wood is quite darkened, possibly from a chemical stain used to deliberately color the wood. There are tinyremnts of shellac trapped in the wood and on the surface of the wood, but there is no intact film of shellac on top of the wood.  Fluorochrome staining shows there is oil trapped in the wood and on the surface of the wood in sample 3.
The finish history in Sample 4 from a carved area of the canopy has the most complicated coating sequence. There are remnants of shellac on top of the wood, followed by a thick accumulation of brownish grit, oil and dust. The second coating generation consists of a few flakes of an uneven, degraded plant resin varnish. These varnish flakes are trapped in another murky layer of dirt and dust, along with one tiny red textile fiber. The two most recent coatings are fragmented, dirty, cracked layers of shellac. There is also a thick layer of wax on the surface which partially dissolved on exposure to the odorless mineral spirits used to cover slip the cast cross-section. Binding media characterization shows that there is oil in the wood, and in the murky dirt layers.
The layers in Sample A from the rear of the right removable knee are too disturbed to identify a coherent sequence of coatings. There are broken fragments of shellac mixed with pigments and a brownish oily layer, as well as trapped dirt, on top of the wood.  
However, there is a more legible coating stratigraphy in Sample B from a claw on the right hairy paw foot. The finish in the cross-section is embrittled so it cleaved away from the wood substrate, leaving a slight gap in the stratigraphy. But it is possible to see in the UV photomicrographs that the first layer on the wood is a thin pigmented stain, followed by a degraded shellac layer. The original shellac is unevenly cracked and has a slightly paler autofluorescence on its surface, likely due to oxidation. There is a thick accumulation of grit and soot on the surface of this first shellac layer, which is followed by a second degraded shellac. The most recent coatings are a brownish oily layer, and an uneven wax coating on the surface.