Etruscan jewelry
The combination of metals was a basic technique. Essentially, there is no such thing as 24 carat gold jewelry. Massive gold is the most malleable metal. It is almost like wax. In order to have jewelry that can pass the test of time and gravity, the Etruscans had to combine their gold with other metals.
Aluminium bottle
Aluminium is a silver-white, soft metal and the most abundant metallic element, comprising 1/12 of the Earth's crust. Aluminum is always found combined with oxygen or other elements in nature and must be processed from ore to produce workable aluminium metal. Aluminum metal is one of the most widely recycled industrial materials due to ease of remelting used aluminum and the expense of processing natural aluminum ores. Bottlecans are made from 100 percent recyclable aluminium through either an extrusion or Coil to Can (C2C) process to a wide range of shapes and sizes. Impact extruded bottles are produced with three times the aluminium of a traditional beer can, which provides for increased insulation. C2C bottles use 30%-40% to less aluminium than impact extruded aluminium bottles. Exal Corporation has pioneered the use C2C technology to manufacture aluminium bottles.
In terms of sustainability aluminium bottles and cans are the most desirable product in the recycling stream as the use of recycled aluminium requires only 5% of the energy required to manufacture virgin aluminium. According to Earth911.com, each year the US aluminium industry pays $800 million for empty aluminium bottles and cans. This is for the benefit of communities, industry and the environment.