Because at the time the price of aluminum was much higher than the price of platinum! This was because the only way known at the time to extract metallic aluminum from its ore were tedious chemical processes that could only yield tiny amounts for enormous effort.
This is the same reason that the tip of the Washington Monument is an aluminum pyramid.
However sometime after the Washington Monument was finished a new molten salt electrolysis process was developed that yielded massive amounts of metallic aluminum very inexpensively and the price of aluminum fell instantly to far less than plain common iron.
Bulk aluminum is usually a silver color. (Think aluminum foil.)
Silver
compact discs are made of polycarbonate plastic followed by a thin layer of aluminum coating over the polycarbonate plastic then finished with a clear protective acrylic coating over the aluminum layer some companies use silver or gold instead of the aluminum layer
Silver is a better heat conductor.
Aluminum
At that time aluminum was more precious than gold.
Kitchen pans are made of aluminum rather than silver for several reasons. Aluminum, although reactive, does not react as strongly as silver does. Silver also has a much lower melting point than aluminum and is more expensive.
They're not
Bulk aluminum is usually a silver color. (Think aluminum foil.)
It's the adjective silver-plated applied to masculine plural nouns, e.g. knives [cuchillos]. Cuchillos plateados = silver-plated knives.
Silver
Aluminum, with atomic number 13. Zirconium has 40 and silver 47.
yes it does.
Silver is, then copper, then gold, and then aluminum. Copper is used for wiring because it is cheaper than silver. Aluminum is not used very much anymore because it can be dangerous when installed improperly.
compact discs are made of polycarbonate plastic followed by a thin layer of aluminum coating over the polycarbonate plastic then finished with a clear protective acrylic coating over the aluminum layer some companies use silver or gold instead of the aluminum layer
Silver grey.
aluminum