Staining of cotton in tissue

We have an interesting autopsy case that demonstrates foreign body emboli in the lung tissue. The foreign bodies resemble cotton fibers. Does anyone know of a special stain that demonstrates cotton fibers? They stain with Congo Red and I have heard that they are acid fast positive. Is this true? Any suggestions are welcome.

Steven M. Crochiere, HT (ASCP)
Histology Supervisor
LifePath Partners @ Mercy Medical Center
299 Carew St.
Springfield, MA 01104

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