Ultra-Etch Kit: 4 x 1.2 ml Syringes & 20 Blue Micro Tips. 35% Phosphoric Acid Gel. Easy placement and rinsing - distinctive blue color enhances placement and ensures complete removal. Ideal viscosity - thixotropic properties ensure precise placement without migrating, even on vertical surfaces. Enhanced capillary action - penetrates the smallest fissures on occlusal surfaces. Peace of mind - unique self-limiting chemistry prevents overetching, creating the optimal surface to receive resin.