Used in textile dyeing as a mordant to fix dyes on fabrics, especially wool. Helps improve color fastness and durability. Also applied in leather tanning to enhance resistance to heat and wear. Historically used in photography and lithography for its light-sensitive properties. Occasionally used in educational labs to grow crystals due to its deep violet color and well-defined crystal structure. Employed as a stain in laboratory settings, particularly for biological samples. Serves as an intermediate in the production of other chromium compounds for industrial processes. Utilized in wastewater treatment to aid in the precipitation of heavy metals. Has limited use as a preservative in certain biological products and medical materials.