Etch-Rite etching gel - 38% Phosphoric Acid, Twin Pack: 2 - 3 mL Syringes and 25 Pre-Bent Applicator Tips. Contains 38% phosphoric acid. Indicated for temporary canal treatment. Formulated for complicated cases requiring calcium hydroxide treatment. The formulation of Etch-Rite 38% Phosphoric Acid Etching gel optimizes its working and handling properties. It can be agitated to lower viscosity to offer a 15-second etch. Conveniently delivered through small-gauge, pre-bent applicator tips, the gel stays precisely in place and will not run onto exposed tissue. It washes off easily, leaving no residue. Each Twin Pack contains 2 (3 ml) syringes gel and 25 applicator tips.