Intermediate, or tertiary, colors are made by mixing a primary color with a secondary color that is next to it. Red-orange, yellow-orange and yellow-green are some intermediate colors. TRY IT! Making a color wheel is a good way to understand how colors work.
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Long before concrete made its appearance on the building scene in Rome, the Romans utilized a volcanic stone native to Italy called tufa to construct their buildings. Although tufa never went out of use, travertine began to be utilized in the late 2nd century B.C.E. because it was more durable.