Kevin Ashton describes exactly what goes into the cans of coke he buys at his local supermarket in Los Angeles. Do you still want to drink this stuff?
The Vons grocery store two miles from my home in Los Angeles, California sells 12 cans of Coca-Cola for $6.59 — 54 cents each. The tool chain that created this simple product is incomprehensibly complex.
Each can originated in a small town of 4,000 people on the Murray River in Western Australia called Pinjarra. Pinjarra is the site of the world’s largest bauxite mine. Bauxite is surface mined — basically scraped and dug from the top of the ground. The bauxite is crushed and washed with hot sodium hydroxide, which separates it into aluminum hydroxide and waste material called red mud. The aluminum hydroxide is cooled, then heated to over a thousand degrees celsius in a kiln, where it becomes aluminum oxide, or alumina. The alumina is dissolved in a molten substance called cryolite, which is a rare mineral from Greenland, and turned into pure aluminum using electricity in a process called electrolysis. The pure aluminum sinks to the bottom of the molten cryolite, is drained off and placed in a mold. It cools into the shape of a long cylindrical bar. The bar is transported west again, to the Port of Bunbury, and loaded onto a container ship bound for — in the case of Coke for sale in Los Angeles — Long Beach.
The bar is transported to Downey, California, where it is rolled flat in a rolling mill, and turned into aluminum sheets. The sheets are punched into circles and shaped into a cup by a mechanical process called drawing and ironing — this not only makes the can but also thins the aluminum. The transition from flat circle to something that resembles a can takes about a fifth of a second. The outside of the can is decorated using a base layer of urethane acrylate, then up to seven layers of colored acrylic paint…
[continues at Medium
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