Congo Red Stain
Congo red stain is intended for staining amyloid in tissue.
Amyloid substance has a selective affinity to Congo red and can be stained readily. Congo red, which is an azo dye with linear configuration, binds hydroxyl of amyloid substance with its amino group while clings on fiber of amyloid substance in parallel and appears red.
1. Congo red solution
2. Alkaline alcohol solution
3. Mayer hematoxylin solution