Sirrus vs sirius

From:Mass Histology Service <>

I had a request to perform a "sirrus red" stain for collagen.  Is "sirrus
red" the same as "sirius red" (c.i. 35780)?
As I understand it, a 2% solution in saturated picric acid for 20 minutes is
the complete stain... right?



James E. Staruk, HT(ASCP)
Mass Histology Service

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