B•Plus Fixative™ produces superb fixation for hematopoietic and lymphoid tissues. It is a highly desirable fixative for bone marrow and lymph node biopsies. B·Plus Fixative™ provides fixation that results in cytologic characteristics comparable to those produced by B-5 fixation. By using B-Plus™, there are no hazardous problems associated with mercury disposal. This is an environmentally attractive bone marrow fixative that produces histology comparable to those using mercury additives. It is also well suited for fixation of lymphoid tissues to be studied immunochemically.