RE: Food colorings in histology
Cochineal is unprocessed carmine.
It is currently used in some soft drinks. It is used in Mayer's alcoholic
cochineal stain for whole mounts of marine invertebrate larvae. It is also
used as a nuclear counterstain in Rinehart and Abul Haj's colloidal iron stain
for acid mucins (Arch. Pathol. 52: 189-194).
I have occasionally used tartrazine (F&DC yellow
#5) as a collagen stain.
Allen A. Smith, Ph.D.
School of Graduate Medical Sciences
Podiatric Medicine and Surgery
Miami Shores, Florida
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