Etch Royale Etch 37% Phosphoric Acid Gel, Bulk Pack: 24 - 1.2 mL Syringes. Readily settles into dentin and enamel. Stays where it is placed; does not run. Washes off completely and easily. Dark blue color for high visibility. Etch-Royale 37% Phosphoric Acid Etching gel immediately sits into dentin and enamel without running onto soft tissue. It has a darker blue color that allows easy visibility even in thin applications.Compared to Etch-Rite, Etch Royale has creamier consistency but with the same properties. Etch-Royale is also thixotropic and washes off easily.Each Bulk Pack includes 24 (1.2 ml) syringes.