Used in histology and plant biology to detect lignin in cell walls. The resorcinol-based staining solution reacts with lignin, producing a red or pink coloration that helps identify lignified tissues under microscopic examination. It is commonly applied in tissue section analysis of wood, stems, and roots to study plant anatomy and development. The method is especially useful for distinguishing lignified fibers, vessels, and tracheids in botanical samples. Suitable for both fresh and fixed tissues, it provides a reliable visual contrast for structural studies in plant morphology and cell differentiation research.