Congo-red with amyloid produces-
The histologic diagnosis of amyloid is based almost entirely on its staining characteristics. The most commonly used staining technique uses the dye Congo red, which under ordinary light impas a pink or red color to amyloid deposits. Under polarized light the Congo red-stained amyloid shows so- called apple-green birefringence Robbins 9 th edition page no. 156
Blue colour
Dark brown colour
Brilliant pink colour
Khaki colour
General pathology