Porcelain Etch Mini Refill, Buffered 9.6% Hydrofluoric Acid. Contains: 2 x 1.2 ml Porcelain Etch syringes. 90-second Porcelain Etch is used to etch porcelain veneers, crowns, bridges, inlays, onlays, and fractured dental porcelain. Will not stain composite or resin cement. 2 - 1.2 ml syringes