Congo Red Stain problems

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From:"Jennings-Siena, Debbie" <> (by way of histonet)
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  Hi everyone,
I would like to ask if anyone knows why amyloid on Congo Red stain would
birefringe as a orange-yellow color instead of apple green?  We are using
the same procedure that we have used for years.  Our procedure is a Puchtler
Modification.  If anyone has any ideas, I would appreciate hearing from you.
Thanks in advance.

Debbie J. Siena, HT(ASCP)QIHC
Histopathology Manager
Baylor University Medical Center
Dallas, TX 75246

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