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Traditionally, gold and silver mosaics are made by laying metallic leaf over glass and then protecting the surface with a further layer of very thin glass. The backing glass is green and blue, and these reverse faces have a depth and shine that can also be used very effectively. Slightly cheaper metallic tiles are also available with a clear glass face and a protective coat of varnish on the back, but these are not so stable in outdoor conditions and may tarnish over time. Mirror tiles with plain and sandblasted finishes can also be used, although the silvering will not last forever in exterior locations and may be affected by chemical reaction with cement-based adhesives. All these tiles can be cut with nippers, although more accurate cuts may be achieved by scoring with a glass cutter first.