True Yellow 2 %, alcoholic is a staining solution used in histology. The main component of the solution is true yellow, a synthetic yellow dye dissolved in a 2% alcoholic solution. This stain is used to highlight certain structures in tissue sections and make them easier to see under the microscope. True yellow can be used, for example, to stain lipids, plasma proteins, and other cellular components. The use of an alcoholic solution promotes rapid and uniform staining and facilitates the analysis and diagnosis of cellular changes.