Angela,
I use CAT hematoxylin as the counterstain on all of my IHC  single and
doublestains.
It is a special formulation that does not need filtering.

As I recall, the CAT denotes  the initials of the scientists who
formulated it,
Cherukian, Allison, Tacha.  I buy mine from Biocare Medical.
www.biocare.net


Let me know how your double stains are working.  We use a few routinely,
here.

 Becky Orr CLA,HT(ASCP)
IHC Lead 
Evanston Northwestern Healthcare
847-570-2771
 



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