It is an alloy of aluminum foil？
Or thickness after rolling to form a sheet of aluminum in aluminum foil is 0.2mm or less. Aluminum is added to the aluminum other metals or non-metallic material, so that the metal strength.
Because aluminum is soft, ductile, with silver-white luster, if the sheet after the rolling, sodium silicate and other material mounted in offset paper made of aluminum foil, but also for printing. But the aluminum foil itself is easily oxidized and darkened, friction, touch, etc. will fade, so does not apply to long-term preservation of stamping book cover or the like.
Aluminum foil is pure aluminum metal, an aluminum metal stamping material directly rolled into a sheet, which is similar to the effect of pure silver foil stamping stamping effect, so called false silver.
