40% aqueous phosphoric acid etchant designed to provide convenient preparation of enamel prior to placing resin-based restorations. For the treatment of enamel margins of Class I, II, III and V composite restorations to prevent micro-leakage; enamel surfaces of Class IV composite restorations for retention and prior to the attachment of orthodontic appliances by means of resin adhesive; occlusal surface of posterior teeth prior to application of fissure sealant resin; and labial surface of teeth prior to application of resin-bonded ceramic or acrylic veneers. Produces micro-mechanical interlock for the keying of resin-based cements and restoratives. Thixotropic, meaning it can be accurately placed on the area to be treated without risk of spreading. Bright colours clearly show the clinician where the etchant is placed and is useful when washing off the product.