Porcelain Etch Gel 1.2ml Syringe Kit 9.6% Hydrofluoric Acid A one-minute application etches porcelain crowns, veneers, inlays and fractured porcelain surfaces prior to bonding. This superior quality porcelain etch gel will not stain porcelain, composites or resin cements. Contains: 4 x 1.2ml syringes gel and 8 applicator tips.