Figure 2 : Preliminary identification of chitin.

From: Discovery of 505-million-year old chitin in the basal demosponge Vauxia gracilenta

Figure 2

Calcofluor white staining of the cleaned surface of V. gracilenta with fluorescence, indicating the presence of polysaccharide-based compounds (a, b). Isolated and HF-demineralized fibers were identified as chitin using NEXAFS spectroscopy (c).