Sodium tetraborate / borax solution 0.25%, prepared from aqua bidest / ultrapure water and sodium tetraborate decahydrate, is used in medical diagnostics, histology and scientific laboratories. As a component of staining kits, such as Araldite stain according to ADAMS and Fuchsin-Borax working solution for Araldite, it plays an important role in the preparation of tissue sections. Sodium tetraborate decahydrate (CAS No.: 1303-96-4) is a borate mineral and serves as a buffer and stabilizer that regulates the pH of the solution. In doing so, it modifies the chemical properties of the staining solution and improves the interaction of the dye with the tissue. The use of this product supports differentiated and accurate visualization of microscopic structures, which is essential for accurate analysis and diagnosis of histological specimens.