Eighteen karat red gold may be made of 25% copper and 75% gold. For 18 karat rose gold, typically about 4% silver is added to 75% gold and 21% copper to give a rose color. 14 karat red gold is often found in the Middle East and contains 41.67% copper.
Redwood Falls is a city in Redwood County in the U.S. state of Minnesota. The population was 5,254 at the 2010 census. It is the county seat.
If you are coming to see the redwoods, my suggestion is the north redwood parks of Humboldt and Del Norte counties. With a limit of 2 - 8 days, the redwoods farthest north are the ones to visit.