Foil stamping is a direct material rolled into sheet metal aluminum, similar to its effect with pure silver stamping stamping effect, so called fake silver. Because aluminum is soft, ductile, with a silvery sheen, if the sheet is rolled back, with the sodium and other substances mounted on offset paper made from aluminum foil, but also for printing. But aluminum foil itself easily oxidized and darken, friction, touch, etc. will fade, and therefore not suitable for long-term preservation of stamping book covers and the like. Differences can be divided according to the thickness of aluminum foil thick foil, single zero and double zero foil foil.

The so-called double-zero foil after its thickness is in mm unit of measure zero decimal two foil, usually an aluminum foil thickness of less than 0.0075mm. When the English expression, thick foil called "heavy gauge foil '', single zero foil called" medium gauge foil ", double zero foil called" light gauge foil ''. Foreign sometimes called foil thickness ≤40ltm light gauge foil, while the thickness of> 40btm foil collectively referred to as heavy gauge foil.