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Pattern of 'spangles' showing on the surface of a galvanized steel tower.
Spangles, as they're known in the trade, can be seen on all manner of galvanized steel parts from lamposts to steel sheet. They are crystallites typically formed during hot-dip galvanizing of steel with zinc. The arrangement of shiny and dull spangles is due to the distribution of lead particles, which were usually present as impurities in the zinc before lead began to be eliminated from galvanizing zinc.