Alcian blue from different manufacturers will produce variances in the 
pH of 0.3 units or so if you simply use the standard recipe.  That may 
or may not be important for your work, but it could affect specificity 
of staining.


Dick Dapson
Anatech Ltd.
1020 Harts Lake Road
Battle Creek, MI  49015
269-964-6450
email@anatechltdusa.com