A Nile blue staining technic for the differentiation of melanin and lipofuscins.

When paraffin sections are stained in 0.05-.01% Nile blue in 1 % sulfuric acid, washed thoroughly in water and mounted in aqueous media, lipofuscins color deep blue, melanins dark green, myelin and red cells lighter greens and background pale green. If, immediately after staining, the preparations are at once extracted with acetone with or without a 1% sulfuric acid rinse, melanins remain dark green, mast cells color purple, lipofuscins and background decolorize and nuclei may stain light green.