<prompt> Amyloid is detected by staining with all exceptMethyl violetAlcain BlueCongo RedThioflavin  <response>: B Alcain Blue Amyloid fibrils are idenfied in biopsy or necropsy tissue sections The systemic amyloidosis offer a choice of bipsy sites; abdominal fat aspirates or renal or rectal biopsies are often perform ed. Microscopically, amyloid depsotis stain pink with the hematoxylin-eosin stain and show metachromasia with crystal violet. The widely used and useful Congo red stain imparts a unique green birefringence when stained tissue sections are viewed using the polarizing microsope. Fluorescent dyes such as thioflavin are sensitive screening stains for amyloid deposits in brain and other tissues; however, specificity should be confirmed. 