Figure 3: A study subject from Group B subjected to diagnostic test (toluidine blue + chemiluminescence) and reference standard (histopathology). The clinical diagnosis of the lesion was erythroleukoplakia in relation to left buccal mucosa. An increased uptake of toluidine blue enhanced by acetowhite hue is seen using chemiluminescence. Histopathology is suggestive of moderate epithelial dysplasia