We have been using it for years.  Here is the info off the MSDS.  We have had no problems in using this fixative.
5-sulfosalicylic acid                   <1%
methanesulfonic acid                 <1%
50% sodium hydroxide               <1%
sodium sulfate                           <2%
zinc sulfate                               <2%
diazolidinyl urea                         <5%
sodium chloride                          <6%
sodium citrate                            <8%
70% glycolic acid                       <16%
40% glyoxal                               <27%
water                                        <38%
Albert

>>> Rob Crawford  01/07/03 03:09PM >>>
Hi all-
 
            Histochoice was recommended to me as a fixative option.  As
I'm not a big fan of using something if I don't know what's in it, I was
hoping someone on the list could enlighten me.  I'm assuming that it's
alcohol based.
            Thanks in advance.
 
Rob Crawford
rcthree@u.washington.edu 
 
Univ. of Washington
Chamberlain Lab
206-221-6386(phone)
206-616-8272(fax)