EDTA, RTU This EDTA solution is specifically formulated for use in our Heat Induced Epitope Retrieval (HIER) method. Supplied as a 100 mL aliquot of 20X concentrate or 1L ready-to-use format. Reagent Type: Antigen Retrieval Reagent Product Size: 1 L Shipping Condition: Wet Ice Store in refrigerator (2–8°C).