LOEFFLER's methylene blue solution, for microscopy and cell counting, 500 mlLOEFFLER's methylene blue solution, for microscopy and cell counting, Density (D) 1 g cm, Boiling point (bp) 100 C LFFLERS methylene blue solution is an aqueous solution. Applications The solution is used for staining bacteria, fungi and blood parasites in blood smears, e. g. together with carbolic fuchsine solution (Art. No. A130) for Ziehl Neelsen staining (detection of TB bacteria). Furthermore, it is used as a vital staining agent for selective