Naphthol Yellow 1% is used in in vitro diagnostics, especially as an integral component of the SHOOBRIGDE polychrome staining kit. Its main use is in the staining of tissue preparations for the visualization of specific cellular structures. When used, dissolved Naphthol Yellow S selectively binds to specific cellular components and imparts a distinctive yellow color. The physical and chemical interactions between the naphthol yellow S and the structures to be stained help to visualize them and facilitate their study. A typical result of using this solution is the highlighting of collagen fibers in histological specimens, allowing detailed analysis of tissue composition. More information on specific application methods and associated staining results can be found on the web pages provided.