Orcein-picroindigocarmine--a new multiple stain

Area of Science:

• Histology
• Pathology
• Biomedical research

Background:

• Histological staining is crucial for visualizing tissue structures.
• Existing staining methods may have limitations in differentiating specific tissue components.

Purpose of the Study:

• To develop and evaluate a new histological staining technique using orcein, indigo carmine, and picric acid.
• To assess the efficacy of the new stain in differentiating various human tissue types and their components.

Main Methods:

• A novel staining solution combining orcein, indigo carmine, and picric acid was prepared.
• The staining technique was applied to paraffin-embedded sections of various human tissues.
• Stained tissue sections were examined microscopically to observe differential coloration.

Main Results:

• The orcein-picroindigocarmine stain produced a wide spectrum of colors (red, brown, yellow, green, blue) in different human tissues.
• Nuclear structures were consistently stained dark brown to dark blue.
• Connective tissue components were clearly differentiated, with collagen fibrils appearing blue and elastic fibers rust brown.
• Epithelial tissues, cartilage, bone, and muscle showed distinct colorations, aiding in structural identification.

Conclusions:

• The orcein-picroindigocarmine staining technique effectively differentiates key histological structures, including connective tissue elements and cellular components.
• This new staining method offers aesthetic and informative results, serving as a potentially valuable supplement or alternative to existing histological stains.