A modern technique, the face of a Perspex print is adhered directly to a piece of acrylic (also known as plexiglass, Perspex or Lucite) with a clear, pH neutral adhesive. The verso is mounted to an aluminum composite backed with a wood or metal cleat. The mounted prints are well protected and are notable for their deep and brilliant colours. Face mounting is considered a permanent process; prints cannot be safely separated from the acrylic surface once mounted.