Mellitic acid is primarily used in the field of analytical chemistry as a chelating agent due to its ability to form stable complexes with metal ions. It is particularly useful in the analysis and separation of metal ions in various samples. In organic synthesis, it serves as a building block for the preparation of more complex organic compounds, including polymers and coordination complexes. Additionally, mellitic acid finds application in the production of certain types of dyes and pigments, where its unique structure contributes to the desired color properties. Its derivatives are also explored in material science for the development of advanced materials with specific electronic or structural characteristics.