Is it true that the colorful part of the flower is called a sepal?

The colorful part of a flower is not typically referred to as a sepal. The sepals are the outermost whorl of a flower and are typically green in color. They are located at the base of the petals and typically protect the developing flower bud. The colorful part of a flower is typically referred to as the petals. Petals are usually located in the center of the flower and are often brightly colored to attract pollinators.