Used as an antioxidant in food and cosmetic products to prevent spoilage and extend shelf life. Employed in the pharmaceutical industry for its anti-inflammatory, antimicrobial, and anticancer properties. Applied in tanning leather due to its ability to bind proteins. Utilized in the synthesis of dyes and ink formulations, especially in traditional iron gall ink. Also used in analytical chemistry as a reagent for estimating total phenolic content in plant extracts and beverages.