According to the manufacturer of "B-plus" at
http://www.bbcus.com/modules.php?op=modload&name=FAQ&file=index&myfaq=yes&id_cat=1&categories=B%95Plus+Fix%99&parent_id=0#2
:
"BiPluso is a trade secret however we can tell you 
that it does not contain mercury and can be 
disposed of the same as your formaldehyde containing 
products. Keep in mind, there are trace amounts of 
zinc in this product and thus needs be disposed 
of accordingly." 

Enough said!  
The web site  www..bbcus.com is difficult 
to navigate. It kills Netscape, and it is slow and 
confusing with the ghastly Windows Explorer. All 
their products seem to be secret mixtures. 

"Gladney, Diane C Ms MACH" wrote:
> We use B-Plus Fixative from BBC Biochemical Corp.  Works great and the
> pathologists are pleased.
> -----Original Message-----
> From: Richard Cartun [mailto:Rcartun@harthosp.org]
> I have a meeting today to discuss the elimination of B5 from our
> Histology Laboratory.  I know this topic has been discussed before, and
> I just searched the archives, but I am looking for more current
> information.  What are people using as a substitute for B5 for lymph
> nodes and bone marrows, and are your pathologists completely satisfied
> with it?  Thank you.
-- 
-------------------------
John A. Kiernan
Department of Anatomy and Cell Biology
The University of Western Ontario
London,   Canada   N6A 5C1
   kiernan@uwo.ca
   http://publish.uwo.ca/~jkiernan/