Sudan IV 0.25 %, alcoholic is a laboratory chemical mainly used in histological staining. It is particularly suitable for the identification and visualization of lipids, as the Sudan IV dye has an affinity for fats and fatty substances.

In use, Sudan IV dye binds to lipid structures within cells or tissues through hydrophobic interactions. The resulting stain is red and allows clear visualization of lipids under the microscope. The alcoholic carrier of the solution facilitates penetration of the dye into cells and binding to lipids.

The use of Sudan IV 0.25%, alcoholic solution enables the detection and examination of lipid structures in biological samples. The results can help characterize the distribution and presence of lipids in cells or tissues. This can be important for the study of metabolic disorders, especially those involving lipids.