COMPARATIVE EVALUATION OF ALUM HEMATOXYLIN FORMULATION FOR OPTIMAL HISTOMORPHOLOGICAL VISUALISATION IN COLORECTAL ADENOCARCINOMA

Abstract

Hematoxylin staining remains fundamental to histopathological diagnosis of colorectal malignancies. Despite extensive use, comparative evaluation of alum hematoxylin formulations on adenocarcinoma specimens remains underexplored. This study evaluated four alum hematoxylin stains: Ehrlich's, Harris's, Cole's, and Gill's on archived colorectal adenocarcinoma tissue to determine optimal stain formulation for nuclear and cytomorphological visualisation. Eight histological sections were prepared from a single established colorectal adenocarcinoma tissue block, with two sections stained using each hematoxylin type. Sections were examined by light microscopy at ×400 magnification, with staining quality assessed by intensity of nuclear uptake, tissue differentiation capability, and morphological clarity. Staining reactions were graded as weakly positive (+), moderately positive (++), strongly positive (+++), or excellently strongly positive (++++). Results revealed Ehrlich's hematoxylin produced excellently strong positive reaction (++++) with superior nuclear and glandular staining, optimal chromatin visualisation, and balanced hematoxylin-eosin colour contrast. Harris's and Cole's hematoxylins produced strongly positive reactions (+++), while Gill's hematoxylin yielded moderately positive staining (++). Ehrlich's formulation demonstrated no background or uneven staining artefacts. These findings establish Ehrlich's alum hematoxylin as the optimal formulation for routine colorectal adenocarcinoma staining, offering superior morphological differentiation critical for histopathological diagnosis and tumour grading. We recommend adoption of Ehrlich's hematoxylin as standard protocol for colorectal cancer tissue processing.