Azophloxine in Two-Dye and Four-Dye Staining Combination

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Abstract
Tissues are fixed in either 10% formalin or Lavdow-sky's mixture. After the tissues are sectioned and mounted, they are stained in hematoxylin, then counterstained for 2 minutes in 0.1% aqueous azophloxine to which 4 drops of acetic acid have been added to each 100 ml. of stain. Sections are then rinsed in 0.2% acetic acid and dehydrated. Azophloxine GA can be used also in a tetrachrome method. Sections are stained in Harris' hematoxylin, washed, and placed in 0.2% acidified aqueous azophloxine for 2 minutes. They are then rinsed in 0.2% acetic acid, stained 1 minute in an aqueous mixture of 4% phosphotungstic acid and 2% orange G solution and rinsed again in 0.2% acetic acid. Finally, they are stained in 0.2% light green for 2 minutes, and differentiated in 0.2% acetic acid for 5 minutes. The advantage in using azophloxine is that it is clear and delicate and when used in a constant concentration, does not overstain if the recommended procedure is followed.

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