Streaking into the mixture, and forming the marbleized pattern, the powdered components at first can be detected in the mixture; the yellow of sulfur here, the white of zinc there. Soon however, one begins to blend into the other, and before that batch is removed, every element is completely mixed in--thoroughly impregnating every inch of the rubber with the proper elements for the purpose intended. General Tires, Akron, Ohio. Sourced from the Library of Congress.