Used primarily in analytical chemistry for the detection and determination of primary and secondary amines, Reinecke salt forms insoluble complexes with these compounds, allowing for their precipitation and identification. It is also employed in the separation of certain metal ions due to its ability to form stable coordination compounds. In addition, Reinecke salt finds application in spectrophotometric methods where its color change upon complexation aids in quantitative analysis. Its use extends to research settings for synthesizing other chromium-based complexes and studying coordination behavior in inorganic chemistry.