This is how a newly melted spot looks in the middle of building up a 3D object. The melted region is about 3/4 of an inch across, and has a glassy surface of amorphous sugar. The top layer is about 1/8 of an inch (3 mm) thick and is uniformly colored a light golden brown-- caramelized in the melt process. However, the right half of the spot appears darker because that half overlaps-- and is fused to-- the dot which is slightly to the side of our top dot but on the layer below. It appears darker because we are looking into a deeper layer of colored sugar.
Read more about the Evil Mad Scientist Laboratories 3D Fabricator Project here.