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Climate change change

16 April 2011

I can’t say offhand how much energy is saved switching from brass bronze-aluminum alloy*  to steel coinage, but it’s said to be substantial, and the reason for Mexico putting smaller coins into circulation.

Those are 25 cent and ten cent U.S. coins on the left, and a € 0.20 on the right for comparison.  It’s a bit of a hassle with the old coins and the new both circulating right now, but I suppose we’ll adjust.  Luckily, the 0.50 peso coin (slightly larger than the old 10 centavo) is ridged the whole way around, the 20 centavo partially ridged.  The 10 centavo has a groove in the edge.  I guess that means you can find them in your pocket… assuming you can find them at all:

* see the comments

2 Comments leave one →
  1. 16 April 2011 11:03 am

    You sure they’re not aluminum? Esther

  2. 16 April 2011 12:09 pm

    If I wasn’t before I sure am now… the “Ley monetaria (1992) — http://www.bibliojuridica.org/libros/1/263/5.pdf — defines the metallurgical standards for coinage. The “bronze” outer ring on the one, two and five peso coin, and the bronze in the ten and twenty peso coins (as well as the old twenty and fifty centavo coins) is alumimum-bronze composition. The inner core on the peso and the centavo coins are Stainless steel. Specificially iron and

    chromium: 16-18%
    nickel: maximum 0.750%
    carbon: maximum 0.120%
    silicon: maximum 1.00%
    manganese: maximum 1.00%
    sulfur: maximum 0.03%
    phosphorus: maximum 0.04

    Boy, Esther… only for you would I be so… um… obsessive.

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