Congo-red stains demonstrated a marked absorption of the dye by some of this material. Figure 1 Biopsy of the Trachea in Case 1, Taken at Bronchoscopy, Showing Submucosal Infiltration of Amyloid.

Amyloid proteins and peptides are associated ... An example of a compound that can do this is the Congo red dye used to stain amyloids that form in nematodes used for research.