Used for rapid detection of active enzyme centers in gels after electrophoresis. Applied in protein research to visualize esterase activity directly in polyacrylamide gels. The two-component ready-to-use system simplifies staining procedure—no preparation needed. Mix both solutions before use, incubate gel, and observe colored bands where enzyme activity is present. Ideal for teaching labs and research settings due to ease of use and fast results. Compatible with various sample types including tissue extracts and purified proteins. Stable formulation allows repeated use over time.